How does backflow occur?

Backflow is generated by cross-connections that have the possibility of permitting pollutants into the drinking water system. Back siphonage can happen when the pressure in a tank is less than the water system's pressure.

Can check valves prevent backflow?

Check valves offer a basic form of backflow prevention, stopping water from flowing in the wrong direction.

Are dual check valves the same as backflow preventers?

Double-check valves (also known as double-check assembly) are somewhere in between a check valve and a backflow preventer. They are usually installed in places where backflow requires to be contained with a one-way valve, but the investment needs to be less than a backflow preventer.

WATTS Backflow Preventers

Designed to prevent potable water contamination from the reverse flow of polluted water. Capable of bearing up to 180 psi pressures and have a maximum operating temperature of 180 degrees F

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Watts backflow preventers are designed to stop potable water contamination from the reverse flow of polluted water. They are employed in industrial settings where chemicals are connected to water...Read more

WATTS -

LF957NRPDA Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Connection	Inlet Size	Inlet Type	Outlet Size	Price (inc. VAT)
A	LF957NRPDA-OSY-LM 8	Flanged Joint	8"	Flanged Joint	8"	£20,386.05	RFQ
A	LF957NRPDA-OSY-CFM 4	Flanged Joint	4"	Flanged Joint	4"	£9,436.62	RFQ
A	LF957NRPDA-DOSY-CFM 8	Grooved Joint	8"	Grooved Joint	8"	£20,497.74	RFQ

WATTS -

Ames Colt Series C500 Reduced Pressure Detector Assemblies

Style	Model	Body Pattern	Inlet Size	Price (inc. VAT)
A	C500-OSY-LM 8	Straight	8"	£16,640.71	RFQ
B	C500-DOSY-G 8	Straight	8"	£16,738.06	RFQ
B	C500-DOSY-C 4	Straight	4"	£7,244.15	RFQ
A	C500-OSY-LM 10	Straight	10"	£23,777.77	RFQ
B	C500-DOSY-C 8	Straight	8"	£16,738.06	RFQ
A	C500-OSY-LM 2 1/2	Straight	2 1/2"	£4,822.87	RFQ
B	C500-DOSY-G 6	Straight	6"	£10,633.91	RFQ
A	C500-OSY-LM 4	Straight	4"	£6,313.54	RFQ
B	C500-DOSY-G 4	Straight	4"	£7,244.15	RFQ
A	C500Z-OSY-LM 8	Z Pattern	8"	£18,133.97	RFQ
A	C500Z-OSY-GPM 10	Z Pattern	10"	£27,265.42	RFQ
A	C500Z-OSY-LM 6	Z Pattern	6"	£10,388.30	RFQ

WATTS -

Ames Colt Series C400N Reduced Pressure Zone Assemblies

Style	Model	Inlet Size	Price (inc. VAT)
A	C400N-DOSY 4	4"	£6,866.58	RFQ
A	C400N-OSY 4	4"	£6,080.54	RFQ
B	C400N-OSY 6	6"	£9,296.27	RFQ

WATTS -

Ames Colt Series LFC500N Reduced Pressure Detector Assemblies

Style	Model	Inlet Size	Max. Temp.	Price (inc. VAT)
A	LFC500N-OSY-CFM 4	4"	110° F	£7,502.43	RFQ
A	LFC500N-OSY-CFM 6	6"	110° F	£11,122.39	RFQ
A	LFC500N-DOSY-LM 6	6"	140° F	£12,440.40	RFQ
A	LFC500N-OSY-GPM 8	8"	110° F	£19,332.32	RFQ
A	LFC500N-DOSY-C 8	8"	140° F	£19,332.32	RFQ
A	LFC500N-OSY-GPM 10	10"	110° F	£28,905.02	RFQ

WATTS -

Ames 4000B Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Size	Price (inc. VAT)
A	D4000B 2	2"	£1,482.23	RFQ
A	4000BM3-LH 3/4	3/4"	£731.98	RFQ

WATTS -

LFU009 Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Size	Max. Temp.	Max. Working Pressure	Min. Temp.	Outlet Size	Price (inc. VAT)
A	LFU009M2-QT 1	1"	180° F	175 PSI	33° F	1"	£1,034.49	RFQ
B	LFU009-QT 1/2	1/2"	180 Degree F	12.1 Bar	33 Degree F	1/2"	£663.22	RFQ
C	LFU009M2-QT 2	2"	180° F	175 PSI	33° F	2"	£2,111.04	RFQ
D	LFU009M2-QT-S 2	2"	180° F	175 PSI	33° F	2"	£2,561.61	RFQ

WATTS -

LF957RPDA Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Size	Max. Temp.	Max. Working Pressure	Min. Temp.	Outlet Size	Type	Price (inc. VAT)
A	LF957RPDA-OSY-GPM 2 1/2	2-1/2"	110 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	£4,748.51	RFQ
A	LF957-RPDA-OSY-CFM 3	3"	110 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	£5,272.05	RFQ
A	LF957RPDA-OSY-GPM 3	3"	110 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	£5,272.05	RFQ
A	LF957RPDA-OSY-GPM 4	4"	110 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	£6,887.64	RFQ
B	LF957RPDA-DOSY-CFM 4	4"	110° F	175 PSI	33° F	4"	Kit	£7,781.75	RFQ
A	LF957-RPDA-OSY-CFM 4	4"	110 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	£6,887.64	RFQ
A	LF957RPDA-OSY-GPM 6	6"	110 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	£9,922.29	RFQ
A	LF957-RPDA-OSY-CFM 6	6"	110 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	£9,922.29	RFQ
C	LF957RPDA-DOSY-CFM 8	8"	110° F	175 PSI	33° F	8"	Kit	£16,342.91	RFQ
C	LF957RPDA-OSY-LM 8	8"	110° F	175 PSI	33° F	8"	Kit	£16,238.39	RFQ
A	LF957-RPDA-OSY-CFM 8	8"	110 Degree F	12.1 Bar	33 Degree F	8"	Valve to Accessory	£16,342.91	RFQ
A	LF957RPDA-OSY-GPM 8	8"	110 Degree F	12.1 Bar	33 Degree F	8"	Valve to Accessory	£16,342.91	RFQ
B	LF957-RPDA-OSY-CFM 10	10"	110° F	175 PSI	33° F	10"	Kit	£19,107.54	RFQ
B	LF957RPDA-OSY-GPM 10	10"	110° F	175 PSI	33° F	10"	Kit	£19,107.54	RFQ

WATTS -

U009 Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Size	Outlet Size	Price (inc. VAT)
A	U009M2-A-PC-QT 1 1/2	1-1/2"	1-1/2"	£1,747.52	RFQ
B	U009-PC-QT-S 1/2	1/2"	1/2"	£750.94	RFQ
C	U009M2-QT 3/4	3/4"	3/4"	£695.49	RFQ

WATTS -

LF909 Series Reduced Pressure Zone Assemblies

Style	Model	Body Material	Inlet Size	Inlet Type	Max. Temp.	Max. Working Pressure	Mfr. Series	Min. Temp.	Outlet Size	Price (inc. VAT)
A	LF909-DNRS-FS	-	-	-	-	-	-	-	-	£6,146.24
B	LF909-DOSY-FS	-	-	-	-	-	-	-	-	£5,151.08
C	LF909-DOSY-FS	-	-	-	-	-	-	-	-	£4,189.42
D	LF909-DNRS-FS	-	-	-	-	-	-	-	-	£4,998.85
E	LF909M1-DOSY-FS	-	-	-	-	-	-	-	-	£22,126.99
D	LF909-DNRS-FS	-	-	-	-	-	-	-	-	£4,703.17
F	LF909-DOSY-FS	-	-	-	-	-	-	-	-	£11,979.97
C	LF909-DOSY-FS	-	-	-	-	-	-	-	-	£3,718.51
G	LF909-NRS-S-FDA 6	Cast Iron	6"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	6"	£12,311.18	RFQ
H	LF909-DOSY 4	Cast Iron	4"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	4"	£13,595.58	RFQ
I	LF909-LF 2 1/2	Cast Iron	2 1/2"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	2-1/2"	£5,979.47	RFQ
J	LF909-NRS 4	Cast Iron	4"	Flanged Joint	110 Degree F	12.06 Bar	LF909 Large	33 Degree F	4"	£7,646.27	RFQ
K	LF909-NRS 3	Cast Iron	3"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	3"	£5,502.70	RFQ
L	LF909-OSY-S-FDA 4	Cast Iron	4"	Flanged Joint	110 Degree F	12.1 Bar	LF909 Large	33 Degree F	4"	£14,763.41	RFQ
G	LF909-NRS-S-FDA 3	Cast Iron	3"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	3"	£5,502.70	RFQ
G	LF909-NRS-S-FDA 4	Cast Iron	4"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	4"	£7,646.27	RFQ
M	LF909-OSY 4	Cast Iron	4"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	4"	£13,595.58	RFQ
K	LF909-NRS 2 1/2	Cast Iron	2 1/2"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	2-1/2"	£5,133.64	RFQ
M	LF909-OSY 6	Cast Iron	6"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	6"	£19,758.01	RFQ
N	LF909-DNRS 4	Cast Iron	4"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	4"	£7,646.27	RFQ
O	LF909-DNRS 6	Cast Iron	6"	Flanged Joint	110 Degree F	12.06 Bar	LF909 Large	33 Degree F	6"	£12,311.18	RFQ
O	LF909-DNRS 2 1/2	Cast Iron	2-1/2"	Flanged Joint	110 Degree F	12.06 Bar	LF909 Large	33 Degree F	2-1/2"	£5,133.64	RFQ
P	LF909-QT-S-FDA 4	Cast Iron	4"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	4"	£17,481.95	RFQ
G	LF909-NRS-S-FDA 2 1/2	Cast Iron	2 1/2"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	2-1/2"	£5,133.64	RFQ
Q	LF909-OSY 3	Cast Iron	3"	Flanged Joint	110° F	175 PSI	LF909 Large	33° F	3"	£10,879.57	RFQ

WATTS -

909RPDA Series Reduced Pressure Detector Assemblies

Style	Model	Inlet Size	Max. Temp.	Max. Working Pressure	Min. Temp.	Outlet Size	Type	Valve Type	Price (inc. VAT)
A	D909RPDA-OSY-CFM 2 1/2	2-1/2"	140 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£11,255.74	RFQ
A	909RPDA-OSY-CFM 2 1/2	2-1/2"	140 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£10,520.23	RFQ
A	909RPDA-OSY-CFM 3	3"	140 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£11,963.16	RFQ
A	909RPDA-OSY-GPM 3	3"	140 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£11,963.16	RFQ
A	909RPDA-D0SY-CFM 3	3"	140 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£12,802.54	RFQ
A	909RPDA-OSY-CFM 4	4"	140 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£14,954.32	RFQ
B	909RPDA-LF-CFM 4	4"	140 Degree F	12.1 Bar	33 Degree F	4"	Kit	No Shutoff Valve	£10,622.68	RFQ
A	909RPDA-DOSY-GPM 4	4"	140 Degree F	12.1 Bar	33 Degree F	4"	Kit	Outside Stem And Yoke Gate Valve	£16,001.48	RFQ
A	909RPDA-OSY-GPM 4	4"	140 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£14,954.32	RFQ
A	909RPDA-D0SY-CFM 4	4"	140 Degree F	12.1 Bar	33 Degree F	4"	Kit	Outside Stem And Yoke Gate Valve	£14,954.32	RFQ
A	909RPDA-OSY-CFM 6	6"	140 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£21,734.81	RFQ
B	909RPDA-LF-GPM 6	6"	140 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	No Shutoff Valve	£15,437.16	RFQ
A	909RPDA-DOSY-GPM 6	6"	140 Degree F	12.1 Bar	33 Degree F	6"	Kit	Outside Stem And Yoke Gate Valve	£21,734.81	RFQ
A	909RPDA-OSY-GPM 6	6"	140 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£21,734.81	RFQ
C	909RPDAM1-OSY-GPM 8	8"	140° F	175 PSI	33° F	8"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£36,345.04	RFQ
C	909RPDAM1-OSY-CFM 8	8"	140° F	175 PSI	33° F	8"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£36,345.04	RFQ
D	909RPDAM1-DOSY-GPM 8	8"	140 Degree F	12.1 Bar	33 Degree F	8"	Kit	Outside Stem And Yoke Gate Valve	£38,890.11	RFQ
D	909RPDAM1-DOSY-CFM 8	8"	140 Degree F	12.1 Bar	33 Degree F	8"	Kit	Outside Stem And Yoke Gate Valve	£36,345.04	RFQ
E	909RPDAM1-LF-GPM 10	10"	140° F	175 PSI	33° F	10"	Valve to Accessory	No Shutoff Valve	£34,188.40	RFQ
C	909RPDAM1-OSY-GPM 10	10"	140° F	175 PSI	33° F	10"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£48,135.39	RFQ
D	909RPDAM1-DOSY-GPM 10	10"	140 Degree F	12.1 Bar	33 Degree F	10"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£48,135.39	RFQ
D	909RPDAM1-DOSY-CFM 10	10"	140 Degree F	12.1 Bar	33 Degree F	10"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£48,135.39	RFQ

WATTS -

957Z Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Size	Inlet Type	Max. Temp.	Max. Working Pressure	Min. Temp.	Outlet Size	Type	Valve Type	Price (inc. VAT)
A	957Z-BFG 2 1/2	2-1/2"	Grooved Joint	110 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	Gear Operated Butterfly Valve	£7,074.29	RFQ
B	957Z-OSY 2 1/2	2-1/2"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£6,431.45	RFQ
B	957Z-NRS 2 1/2	2-1/2"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	Non Rising Stem Gate Valve	£4,372.32	RFQ
B	957Z-QT 2 1/2	2-1/2"	Female Threaded	110 Degree F	12.1 Bar	33 Degree F	2-1/2"	Valve to Accessory	Quarter Turn Ball Valve	£5,565.39	RFQ
A	957Z-BFG 3	3"	Grooved Joint	110 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	Gear Operated Butterfly Valve	£7,725.57	RFQ
B	957Z-NRS 3	3"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	Non Rising Stem Gate Valve	£5,106.41	RFQ
B	957Z-OSY 3	3"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	3"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£7,025.19	RFQ
B	957Z-OSY 4	4"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£8,542.51	RFQ
B	957Z-NRS 4	4"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	Non Rising Stem Gate Valve	£6,414.60	RFQ
C	957Z-DOSY 4	4"	Flanged Joint	140° F	175 PSI	33° F	4"	Kit	Outside Stem And Yoke Gate Valve	£9,652.79	RFQ
C	957Z-QT 4	4"	Female Threaded	110 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	Quarter Turn Ball Valve	£8,164.91	RFQ
A	957Z-BFG 4	4"	Grooved Joint	110 Degree F	12.1 Bar	33 Degree F	4"	Valve to Accessory	Gear Operated Butterfly Valve	£9,395.93	RFQ
B	957Z-OSY 6	6"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	Outside Stem And Yoke Gate Valve	£13,785.06	RFQ
B	957Z-NRS 6	6"	Flanged Joint	110 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	Non Rising Stem Gate Valve	£10,363.04	RFQ
A	957Z-BFG 6	6"	Grooved Joint	110 Degree F	12.1 Bar	33 Degree F	6"	Valve to Accessory	Gear Operated Butterfly Valve	£15,164.86	RFQ

WATTS -

957RPDA Series Reduced Pressure Detector Assemblies

Style	Model	Inlet Size	Outlet Size	Price (inc. VAT)
A	957-RPDA-OSY-CFM 3	3"	3"	£4,973.07	RFQ
A	957-RPDA-OSY-CFM 4	4"	4"	£6,497.41	RFQ
A	957-RPDA-OSY-CFM 6	6"	6"	£9,358.02	RFQ
A	957-RPDA-OSY-CFM 8	8"	8"	£15,418.92	RFQ
A	957-RPDA-OSY-CFM 10	10"	10"	£18,023.74	RFQ

WATTS -

994 Series Reduced Pressure Zone Assemblies

Style	Model	Inlet Connection	Inlet Size	Inlet Type	Outlet Connection	Outlet Size	Outlet Type	Type	Valve Type	Price (inc. VAT)
A	994-DOSY 2 1/2	Flanged Joint	2 1/2"	Flanged Joint	Flanged Joint	2-1/2"	Flanged Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£6,017.37	RFQ
A	994-OSY 8	Flanged Joint	8"	Flanged Joint	Flanged Joint	8"	Flanged Joint	Kit	Outside Stem And Yoke Gate Valve	£20,142.67	RFQ
A	994-DOSY 4	Flanged Joint	4"	Flanged Joint	Flanged Joint	4"	Flanged Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£7,738.22	RFQ
A	994-DOSY 3	Flanged Joint	3"	Flanged Joint	Flanged Joint	3"	Flanged Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£6,995.70	RFQ
B	994-NRS 6	Flanged Joint	6"	Flanged Joint	Flanged Joint	6"	Flanged Joint	Valve to Accessory	Non Rising Stem Gate Valve	£10,830.42	RFQ
B	994-NRS 3	Flanged Joint	3"	Flanged Joint	Flanged Joint	3"	Flanged Joint	Valve to Accessory	Non Rising Stem Gate Valve	£5,940.18	RFQ
C	994-NRS 2 1/2	Flanged Joint	2 1/2"	Flanged Joint	Flanged Joint	2-1/2"	Flanged Joint	Valve to Accessory	Non Rising Stem Gate Valve	£5,260.83	RFQ
A	994-OSY 6	Flanged Joint	6"	Flanged Joint	Flanged Joint	6"	Flanged Joint	Kit	Outside Stem And Yoke Gate Valve	£11,505.59	RFQ
A	994-OSY 4	Flanged Joint	4"	Flanged Joint	Flanged Joint	4"	Flanged Joint	Kit	Outside Stem And Yoke Gate Valve	£7,230.12	RFQ
A	994-OSY 3	Flanged Joint	3"	Flanged Joint	Flanged Joint	3"	Flanged Joint	Kit	Outside Stem And Yoke Gate Valve	£6,538.14	RFQ
D	994-LF 10	Flanged Joint	10"	Flanged Joint	-	10"	-	Valve to Accessory	No Shutoff Valve	£20,622.30	RFQ
A	994-DNRS 3	Flanged Joint	3"	Flanged Joint	Flanged Joint	3"	Flanged Joint	Valve to Accessory	Non Rising Stem Gate Valve	£5,940.18	RFQ
E	994-LF 8	Flanged Joint	8"	Flanged Joint	-	8"	-	Valve to Accessory	No Shutoff Valve	£15,871.90	RFQ
B	994-NRS 8	Flanged Joint	8"	Flanged Joint	Flanged Joint	8"	Flanged Joint	Valve to Accessory	Non Rising Stem Gate Valve	£18,958.64	RFQ
D	994-LF 6	Flanged Joint	6"	Flanged Joint	-	6"	-	Valve to Accessory	No Shutoff Valve	£8,966.41	RFQ
A	994-OSY 2 1/2	Flanged Joint	2 1/2"	Flanged Joint	Flanged Joint	2-1/2"	Flanged Joint	Kit	Outside Stem And Yoke Gate Valve	£5,622.94	RFQ
A	994-OSY 10	Flanged Joint	10"	Flanged Joint	Flanged Joint	10"	Flanged Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£27,450.10	RFQ
A	994-OSY-GXG 2 1/2	Grooved Joint	2 1/2"	Grooved Joint	Grooved Joint	2-1/2"	Grooved Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£6,017.37	RFQ
A	994-OSY-GXG 8	Grooved Joint	8"	Grooved Joint	Grooved Joint	8"	Grooved Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£21,552.86	RFQ
A	994-OSY-GXG 3	Grooved Joint	3"	Grooved Joint	Grooved Joint	3"	Grooved Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£6,995.70	RFQ
A	994-OSY-GXG 6	Grooved Joint	6"	Grooved Joint	Grooved Joint	6"	Grooved Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£12,311.28	RFQ
A	994-OSY-GXG 4	Grooved Joint	4"	Grooved Joint	Grooved Joint	4"	Grooved Joint	Valve to Accessory	Outside Stem And Yoke Gate Valve	£7,738.22	RFQ

WATTS -

919 Series Reduced Pressure Zone Backflow Preventer Assemblies

Style	Model	Body Pattern	Body Style	Inlet Size	Max. Temp.	Max. Working Pressure	Min. Temp.	Outlet Size	Seat Material	Price (inc. VAT)
A	919-LF 1	-	-	1"	180 Degree F	12.1 Bar	33 Degree F	1"	Polymer	£794.45	RFQ
B	919-QT-CT 3/4	-	-	-	-	-	-	-	-	£717.26	RFQ
B	919-QT-SH 1 1/4	-	-	-	-	-	-	-	-	£1,331.33	RFQ
B	919-QT-SH 2	-	-	-	-	-	-	-	-	£1,639.44	RFQ
C	919-QT-SH 1	-	Inline	1"	180 Degree F	12.1 Bar	33 Degree F	1"	Polymer	£839.39	RFQ
B	919-QT-SH 1/2	-	-	-	-	-	-	-	-	£544.61	RFQ
D	919-ZQT 1 1/2	-	Z-Pattern	1-1/2"	180 Degree F	12.1 Bar	33 Degree F	1-1/2"	Polymer	£1,727.88	RFQ
D	919-ZQT 3/4	-	Z-Pattern	3/4"	180 Degree F	12.1 Bar	33 Degree F	3/4"	Polymer	£1,010.60	RFQ
E	919-QT-S 3/8	-	-	-	-	-	-	-	-	£491.98	RFQ
E	919-QT-S 1/4	-	-	-	-	-	-	-	-	£468.80	RFQ
B	919-QT 1/4	-	-	-	-	-	-	-	-	£418.98	RFQ
C	919-QT-CT 2	-	Inline	2"	180 Degree F	12.1 Bar	33 Degree F	2"	Polymer	£1,646.45	RFQ
C	919-QT-CT 1 1/4	-	-	-	-	-	-	-	-	£1,323.62	RFQ
E	919-LF 1 1/2	-	-	-	-	-	-	-	-	£1,417.67	RFQ
C	919-QT-CT 1	-	-	-	-	-	-	-	-	£828.15	RFQ
E	919-QT-LH 1 1/4	-	-	-	-	-	-	-	-	£1,350.30	RFQ
C	919-QT 3/4	-	Inline	3/4"	180 Degree F	12.1 Bar	33 Degree F	3/4"	Engineered Plastic	£464.57	RFQ
E	919-LF 3/4	-	-	-	-	-	-	-	-	£684.99	RFQ
E	919-LF 1 1/4	-	-	-	-	-	-	-	-	£1,263.29	RFQ
F	919-QT-S 3/4	-	Inline	3/4"	180 Degree F	12.1 Bar	33 Degree F	3/4"	Engineered Plastic	£495.47	RFQ
F	919-QT-S 1 1/2	-	Inline	1-1/2"	180 Degree F	12.1 Bar	33 Degree F	1-1/2"	Polymer	£1,073.69	RFQ
G	919-LF 1/2	-	-	1/2"	180° F	175 PSI	33° F	-	Polymer	£487.74	RFQ
H	919-QT-S 1	Inline	Inline	1"	180° F	175 PSI	33° F	1"	Polymer	£548.46	RFQ
I	919-QT-S 2	Inline	Inline	2"	180° F	175 PSI	33° F	2"	Engineered Plastic	£1,178.23	RFQ
J	919-QT-S 1/2	Inline	Inline	1/2"	180° F	175 PSI	33° F	1/2"	Polymer	£459.61	RFQ

WATTS -

3000SE Series Double Check Detector Backflow Preventer Assemblies

Style	Model	Inlet Connection	Price (inc. VAT)
A	3000SE-LG-CFM 2 1/2	-	£6,272.85	RFQ
A	3000SE-OSY-CFM 2 1/2	-	£8,285.64	RFQ
A	3000SE-LG-LM 2 1/2	Flanged Joint	£6,124.07	RFQ
A	3000SE-OSY-LM 2 1/2	Flanged Joint	£8,135.45	RFQ
A	3000SE-OSY-GPM 2 1/2	Flanged Joint	£8,285.64	RFQ
A	3000SE-LG-GPM 2 1/2	Grooved Joint	£6,272.85	RFQ

WATTS -

Double Check Valve Backflow Preventer Assemblies

Style	Model	Body Material	Disc Material	Inlet Size	Item	Max. Temp.	Min. Temp.	Seat Material	Price (inc. VAT)
A	200-LBV 2	Bronze	Silicone	2"	Double Check Valve Assembly	180° F	33° F	Rubber	£830.27	RFQ
B	870V-4-DC-LG-DIN-N&V	Ductile Iron	EPDM	4"	Reduced Press. Zone Assembly	140° F	32° F	Stainless Steel	£3,113.26	RFQ

WATTS -

200B Series Double Check Valve Assemblies

Style	Model	Inlet Size	Price (inc. VAT)
A	200B 1	1"	£467.42	RFQ
A	200B 2	2"	£970.60	RFQ
B	200B 3/4	3/4"	£413.36	RFQ

WATTS -

919 Series Reduced Pressure Zone Assemblies

Style	Model	Body Pattern	Inlet Size	Seat Material	Type	Price (inc. VAT)
A	919-QT 1 1/4	Inline	1 1/4"	Engineered Plastic	Valve to Accessory	£912.08	RFQ
B	919-AQT 3/4	N Pattern	3/4"	Polymer	Valve to Accessory	£879.37	RFQ
B	919-AQT 1/2	N Pattern	1/2"	Polymer	Kit	£763.57	RFQ

WATTS -

Ames Colt Series LFC500Z Reduced Pressure Detector Assemblies

Style	Model	Inlet Size	Price (inc. VAT)
A	LFC500Z-OSY-CFM 2 1/2	2 1/2"	£5,743.67	RFQ
A	LFC500Z-OSY-GPM 2 1/2	2 1/2"	£5,743.67	RFQ
A	LFC500Z-OSY-CFM 4	4"	£7,502.43	RFQ
A	LFC500Z-OSY-CFM 8	8"	£19,332.32	RFQ

WATTS -

Backflow Preventers

Style	Model	Inlet Size	Price (inc. VAT)
A	994-NRS	-	£4,932.58
B	919A-QT	-	-	RFQ
C	L7U2-2-TC-QT 1	1"	£821.12	RFQ
D	L7U2-2-TC 3/4	3/4"	£642.16	RFQ

WATTS -

Ames Colt Series C400 Reduced Pressure Zone Assemblies

Style	Model	Inlet Connection	Inlet Size	Outlet Connection	Price (inc. VAT)
A	C400-OSY-FXG 6	Flanged Joint	6"	Grooved Joint	£8,636.54	RFQ
B	C400-OSY 2 1/2	Flanged Joint	2 1/2"	Flanged Joint	£3,645.24	RFQ
B	C400-DOSY 2 1/2	Flanged Joint	2 1/2"	Flanged Joint	£4,118.24	RFQ
B	C400-OSY 6	Flanged Joint	6"	Flanged Joint	£8,636.54	RFQ
B	C400-OSY 3	Flanged Joint	3"	Flanged Joint	£4,098.60	RFQ
B	C400-DOSY 6	Flanged Joint	6"	Flanged Joint	£9,760.86	RFQ
A	C400-OSY-GXG 3	Grooved Joint	3"	Grooved Joint	£4,098.60	RFQ
A	C400-OSY-GXG 8	Grooved Joint	8"	Grooved Joint	£14,662.36	RFQ
A	C400-NRS-GXG 3	Grooved Joint	3"	Grooved Joint	£4,078.96	RFQ

12...7 8

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WATTS Backflow Preventers

Designed to prevent potable water contamination from the reverse flow of polluted water. Capable of bearing up to 180 psi pressures and have a maximum operating temperature of 180 degrees F

LF957NRPDA Series Reduced Pressure Zone Assemblies

Ames Colt Series C500 Reduced Pressure Detector Assemblies

Ames Colt Series C400N Reduced Pressure Zone Assemblies

Ames Colt Series LFC500N Reduced Pressure Detector Assemblies

Ames 4000B Series Reduced Pressure Zone Assemblies

LFU009 Series Reduced Pressure Zone Assemblies

LF957RPDA Series Reduced Pressure Zone Assemblies

U009 Series Reduced Pressure Zone Assemblies

LF909 Series Reduced Pressure Zone Assemblies

909RPDA Series Reduced Pressure Detector Assemblies

957Z Series Reduced Pressure Zone Assemblies

957RPDA Series Reduced Pressure Detector Assemblies

994 Series Reduced Pressure Zone Assemblies

919 Series Reduced Pressure Zone Backflow Preventer Assemblies

3000SE Series Double Check Detector Backflow Preventer Assemblies

Double Check Valve Backflow Preventer Assemblies

200B Series Double Check Valve Assemblies

919 Series Reduced Pressure Zone Assemblies

Ames Colt Series LFC500Z Reduced Pressure Detector Assemblies

Backflow Preventers

Ames Colt Series C400 Reduced Pressure Zone Assemblies

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WATTS Backflow Preventers Designed to prevent potable water contamination from the reverse flow of polluted water. Capable of bearing up to 180 psi pressures and have a maximum operating temperature of 180 degrees F

Frequently Asked Questions

How does backflow occur?

Can check valves prevent backflow?

Are dual check valves the same as backflow preventers?

We are here to help!

Looking for a part not listed here?

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WATTS Backflow Preventers

Designed to prevent potable water contamination from the reverse flow of polluted water. Capable of bearing up to 180 psi pressures and have a maximum operating temperature of 180 degrees F