Dielectric Unions

Filter

Dielectric unions provide insulation between incompatible materials for joining them safely. They avoid electrolysis, which leads to corrosion or pipe failure. They are ideal for pipe sizes ranging from 3/4 to 4 inches.

WATTS -

LF301 Series Dielectric Unions

StyleModelInlet SizeOutlet SizeInsulation MaterialMax. Working PressureAdapter MaterialGasket MaterialInlet MaterialInlet TypePrice (inc. VAT)
ALF301 1 1/21 1/2"1 1/2"Plastic-SteelEPDMSteelFemale Threaded£36.52
ALF301 1 1/41 1/4"1 1/4"Plastic-SteelEPDMSteelFemale Threaded£23.99
ALF301 11"1"Plastic-SteelEPDMSteelFemale Threaded£15.61
BLF301 1/21/2"1/2"Plastic250 psiSteelEPDMSteelFemale Threaded£9.65
ALF301 22"2"Plastic-SteelEPDMSteelFemale Threaded£50.71
ALF301 3/43/4"3/4"Plastic-SteelEPDMSteelFemale Threaded£9.69
WATTS -

3001A Series Dielectric Unions

StyleModelAdapter MaterialInlet SizeOutlet SizeMax. Working PressureInsulation MaterialGasket MaterialInlet MaterialInlet TypePrice (inc. VAT)
A3001A 1/2Malleable Iron1/2"-250 psiPolysulfoneBuna NIronFemale Threaded£20.03
RFQ
B3001A 1 1/4Steel1 1/4"1 1/4"--Buna NIronFemale Threaded£58.85
B3001A 1 1/2Steel1 1/2"1 1/2"--Buna NIronFemale Threaded£100.39
B3001A 2Steel2"2"--Buna NIronFemale Threaded£124.09
WATTS -

RK-3000 Series Dielectric Union Repair Kit

StyleModelKit ContentsKit TypeAda CompliantPrice (inc. VAT)
AKIT GA-J---£6.83
BKIT GB-E---£26.97
CKIT GA-C---£6.83
DKIT GA-D---£8.36
EKIT GB-F---£42.15
FKIT GB-A---£12.16
GKIT GA-G---£6.08
HKIT GB-C---£16.34
IKIT GA-H---£6.83
JKIT GB-D---£22.05
KKIT GA-F2 GA Gaskets Per KitGasket Kit-£11.02
LKIT GA-R2 GA Gaskets Per KitGasket Kit-£37.23
MKIT GA-E2 GA Gaskets Per KitGasket Kit-£8.73
NKIT GA-L2 GA Gaskets Per KitGasket Kit-£12.91
OKIT GA-A2 GA Gaskets Per KitGasket Kit-£5.67
PKIT GA-M2 GA Gaskets Per KitGasket Kit-£16.34
QKIT GA-B2 GA Gaskets Per KitGasket Kit-£4.67
RKIT GA-P2 GA Gaskets Per KitGasket Kit-£37.23
SKIT GA-Q2 GA Gaskets Per KitGasket Kit-£42.55
TKIT GB-B2 GB Gaskets Per KitGasket Kit-£13.69
UINK-F-KIT2 Insulators Per KitInsulator Kit-£9.10
VINK-C-KIT2 Insulators Per KitInsulator KitN£6.83
WINK-B-KIT2 Insulators Per KitInsulator Kit-£6.08
XINK-H-KIT2 Insulators Per KitInsulator KitN£9.10
YINK-D-KIT2 Insulators Per KitInsulator Kit-£6.83
WATTS -

RK-3100/3110/3200 Series Dielectric Union Repair Kit

StyleModelKit ContentsKit TypePrice (inc. VAT)
AINS-KIT 5/8100 Insulators Per KitInsulator Kit£9.51
BINS-KIT 1/2100 Insulators Per KitInsulator Kit£8.36
CINS-KIT 7/8100 Insulators Per KitInsulator Kit£10.63
DINS-KIT 3/4100 Insulators Per KitInsulator Kit£10.63
ZURN -

DUXLC Dielectric Pipe Fittings

StyleModelMPN
A1-DUXLC1-DUXLC
RFQ
B2-DUXLC2-DUXLC
RFQ
C3-DUXLC3-DUXLC
RFQ
D12-DUXLC12-DUXLC
RFQ
E34-DUXLC34-DUXLC
RFQ
F112-DUXLC112-DUXLC
RFQ
G114-DUXLC114-DUXLC
RFQ
H212-DUXLC212-DUXLC
RFQ
ZURN -

DUXL Dielectric Pipe Fittings

StyleModelApplication
A12-DUXL-
RFQ
B1-DUXL-
RFQ
A112-DUXLPotablewater
RFQ
A114-DUXLPotablewater
RFQ
StyleModelInlet Size
A43430055081 1/2"
RFQ
A43430055061 1/4"
RFQ
A43430055041"
RFQ
A43430055001/2"
RFQ
A43430055102"
RFQ
A43430055023/4"
RFQ
APPROVED VENDOR -

Dielectric Union, FIP x Solder

StyleModelPipe SizeConnection TypeBody MaterialMax. PressureMax. Temp.Price (inc. VAT)
A168-007NL1 1/2"Fip x SolderBrass, Steel250 psi180°F£66.74
B168-005NL1"Fip x SolderBrass, Steel250 psi180°F£28.53
C2TEZ91/2"Fip x SolderBrass, Steel250 psi180°F£14.25
D2TFA13/4"Fip x SolderBrass, Steel250 psi180°F£15.52
WATTS -

LF3100 Series, Dielectric Flange, FIP x Solder

StyleModelPipe SizeMax. PressurePipe Fitting MaterialFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeConnection TypeBody MaterialBasic Pipe Fitting MaterialPrice (inc. VAT)
A2 1/2 LF31002 1/2"175 psiCopper, Iron--Fip x SolderCopper, IronMetal£323.09
B2 LF 3100 2"2"250 psiBrass, Malleable Iron2"2"Fip x Solder-Metal£299.80
C3 LF31003"175 psiCopper, Iron3"3"Fip x SolderCopper, IronMetal£407.99
WATTS -

LF3002 Series Dielectric Unions

StyleModelPipe SizeConnection TypeInsulation MaterialBody MaterialGasket MaterialMax. PressureNut MaterialAdapter MaterialPrice (inc. VAT)
ALF3002 3/4--Polysulfone-Buna N250 psiSteelSteel£40.00
BLF3002 11"Fip x Solder-Copper, IronBuna N250 psiSteel-£28.14
WATTS -

LF3004 Series Dielectric Unions

Watts LF3004 Series dielectric unions are used in commercial and industrial applications to prevent accelerated corrosion and deterioration in piping systems caused by galvanic and stray currents. They are installed between pipes made from dissimilar metals. These dielectric unions feature steel / iron / galvanised malleable iron / malleable iron & galvanised steel construction for structural rigidity and long service life. They have polysulfone insulation to prevent electrical hazards during operations and come with Buna-N gaskets for secure & reliable sealing between the pipes.

StyleModelPipe SizeBody MaterialNut MaterialHex SizeAdapter MaterialFitting Side A MaterialFitting Side B MaterialInlet MaterialPrice (inc. VAT)
ALF3004 1 1/2--Malleable Iron-Malleable Iron--Malleable Iron£125.38
BLF3004 3/4--Steel-Steel--Steel£47.02
ALF3004 1/2--Steel-Steel--Steel£41.23
BLF3004 1 1/4--Malleable Iron-Steel--Steel£82.50
ALF3004 1--Steel-Steel--Steel£61.87
C11/2 LF30041 1/2"Malleable IronMalleable Iron3 1/2"-Malleable IronMalleable Iron-£75.15
B1 1/4 LF30041 1/4"IronMalleable Iron2 3/4"-SteelSteel-£57.26
D1 LF 3004-11"-Steel2 1/4"-SteelSteel-£76.31
D1/2 LF 3004-1/21/2"-Steel1 5/8"-SteelSteel-£39.27
ELF3004 22"Malleable IronMalleable Iron4 1/8"----£119.82
D3/4 LF 3004 3/43/4"-Steel1 7/8"-SteelSteel-£44.78
WATTS -

Gasket Kits

StyleModelKit ContentsKit TypePrice (inc. VAT)
AKIT GB-M2 GB Gaskets Per KitGasket Kit£42.15
BKIT GB-K2 GB Gaskets Per KitGasket Kit£22.05
CKIT GB-R2 GB Gaskets Per KitGasket Kit£77.89
DKIT GB-Q2 GB Gaskets Per KitGasket Kit£49.76
EKIT GB-N2 GB Gaskets Per KitGasket Kit£40.25
FKIT GB-G2 GB Gaskets Per KitGasket Kit£13.69
GKIT GB-P2 GB Gaskets Per KitGasket Kit£47.12
HKIT GB-L2 GB Gaskets Per KitGasket Kit£26.97
IKIT GB-H2 GB Gaskets Per KitGasket Kit£13.69
StyleModelInlet SizeMax. Working PressureGasket MaterialGasket Maximum PressureGasket Maximum TemperatureInlet MaterialInlet Thread TypeInlet TypePrice (inc. VAT)
A3004 1 1/41 1/4"250 psiBuna N250 psi180°FIronNPTFemale Threaded£67.63
RFQ
A3004 1/21/2"250 psiBuna N250 psi180°FIronNPTFemale Threaded£33.82
RFQ
WATTS -

LF3100 Series Dielectric Unions

StyleModelInlet SizeOutlet SizeMax. Working PressureInsulation MaterialAdapter MaterialGasket MaterialGasket Maximum PressureGasket Maximum TemperaturePrice (inc. VAT)
ALF3100M3 2 1/22 1/2"2 1/2"175 psiPolysulfoneCast IronBuna N250 psi180°F£452.84
RFQ
BLF3100M3 33"3"175 psiPolysulfoneCast IronBuna N250 psi180°F£621.10
RFQ
BLF3100M3 44"4"175 psiPolysulfoneCast IronBuna N250 psi180°F£1,643.87
RFQ
WATTS -

LF3110 Series Dielectric Unions

StyleModelPipe SizeConnection TypeBody MaterialMax. PressureGasket MaterialMax. Temp.Gasket Maximum PressureGasket Maximum TemperaturePrice (inc. VAT)
ALF3110-LF 3---175 psi--250 psi180°F£747.29
RFQ
BLF3110 2 1/22 1/2"SolderBrass175 psiBuna N180°F--£543.84
CLF3110 33"SolderBrass175 psiBuna N180°F--£527.39
WATTS -

LF3006 Series Dielectric Unions

StyleModelPipe SizeNut MaterialHex SizeFitting Side A MaterialFitting Side B MaterialAdapter MaterialFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizePrice (inc. VAT)
ALF3006 1-Steel---Steel--£61.87
ALF3006 2-Malleable Iron---Malleable Iron--£185.60
ALF3006 3/4-Steel---Steel--£47.02
BLF3006 1/2-Steel---Steel--£35.48
C1 1/2 LF30061 1/2"Malleable Iron3 1/2"Malleable IronMalleable Iron---£74.10
DLF3006 1 1/41 1/4"Steel2 3/4"-----£51.88
E1 LF30061"Steel2 1/4"SteelSteel-1"1"£38.07
F1/2 LF30061/2"Steel1 5/8"SteelSteel-1/2"1/2"£25.77
G2 LF30062"Malleable Iron4 1/8"Malleable IronMalleable Iron-2"2"£151.90
H3/4 LF30063/4"Steel1 7/8"SteelSteel-3/4"3/4"£28.85
StyleModelInlet SizeOutlet SizeInsulation MaterialAdapter MaterialGasket MaterialInlet MaterialInlet TypeLeadPrice (inc. VAT)
ALF3005A 1/21/2"1/2"PolysulfoneSteelBuna NSteelMale ThreadedNot Present£23.60
ALF3005A 3/43/4"3/4"PolysulfoneSteelBuna NSteelMale ThreadedNot Present£22.48
WATTS -

LF3003 Series Dielectric Unions

Watts LF3003 Series dielectric unions are installed at the junction of pipes with varying metal compositions, such as water heaters or pumps, to isolate the metals and reduce potential corrosion caused by electrolysis. These unions effectively maintain water quality and extend the lifespan of plumbing systems by preventing leaks and deterioration due to the chemical reactions caused by metal interaction. The brand's LF3003 Series dielectric unions safeguard water distribution systems, ensuring reliability and durability. They come with a comprehensive assembly consisting of a union nut, two tailpieces and a gasket. This combination creates a robust barrier against electric currents, effectively preventing galvanic corrosion. They have a design with a female iron pipe thread to female brass pipe thread connection, facilitating seamless integration and secure attachment between different types of pipes. These dielectric unions have Buna-N gasket, preventing leakage.

StyleModelPipe SizeNut MaterialHex SizeAdapter MaterialFitting Side B MaterialInlet MaterialInlet SizeOutlet SizePrice (inc. VAT)
ALF3003 1 1/4-Malleable Iron-Steel-Steel1 1/4"1 1/4"£155.88
BLF3003 2-Malleable Iron-Malleable Iron-Malleable Iron2"2"£284.58
CLF3003 1 1/21 1/2"Malleable Iron3 1/2"-----£133.93
D11/4 LF30031 1/4"Steel2 3/4"-Steel---£94.62
CLF3003 11"Steel2 1/4"-----£52.02
CLF3003 1/21/2"Steel1 5/8"-----£33.20
C2 LF30032"Malleable Iron4 1/8"-Malleable Iron---£158.63
CLF3003 3/43/4"Steel1 7/8"-----£40.30
WATTS -

LF4001E Series Dielectric Unions

StyleModelInlet SizeNut MaterialOutlet SizeInsulation MaterialMax. Working PressureAdapter MaterialGasket MaterialInlet MaterialPrice (inc. VAT)
ALF4001E 1 1/21 1/2"Malleable Iron1 1/2"Polysulfone250 psiSteelBuna NSteel£153.41
ALF4001E 1 1/41 1/4"Steel1 1/4"Polysulfone250 psiSteelBuna NSteel£105.57
ALF4001E 11"Steel1"Polysulfone250 psiSteelBuna NSteel£64.75
ALF4001E 1/21/2"Steel1/2"Polysulfone250 psiSteelBuna NSteel£29.27
BLF4001E 22 1/2"Malleable Iron2 1/2"Polysulfone-SteelBuna NSteel£215.28
CLF4001E 3/43/4"Steel3/4"Polysulfone-SteelBuna NSteel£29.27
WATTS -

LF3001A Series Dielectric Unions

StyleModelPipe SizeHex SizeInlet SizeNut MaterialOutlet SizeFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeConnection TypePrice (inc. VAT)
ALF3001A 2--2"Malleable Iron2"---£151.06
ALF3001A 1 1/4--1 1/4"Steel1 1/4"---£71.77
ALF3001A 3/4--3/4"Steel3/4"---£24.28
ALF3001A 1--1"Steel1"---£43.02
ALF3001A 1 1/2--1 1/2"Malleable Iron1 1/2"---£122.20
BLF3001A 1/2--1/2"Steel1/2"---£25.56
C11/2 LF 3001A-1 1/2"1 1/2"2 3/4"-----Fip x Solder£64.85
C11/4 LF 3001A-1 1/4"1 1/4"2 1/4"-----Fip x Solder£46.56
C1 LF 3001A-1"1"1 7/8"---1"1"Fip x Solder£28.90
C1/2 LF 3001A-1/2"1/2"1 1/2"-----Fip x Solder£16.41
C2 LF 3001A-2"2"3 1/2"---2"2"Fip x Solder£85.35
C3/4 LF 3001A-3/4"3/4"1 5/8"---3/4"3/4"Fip x Solder£19.40
WATTS -

LF3007 Series Dielectric Unions

StyleModelInlet SizeOutlet SizeInsulation MaterialMax. Working PressureAdapter MaterialGasket MaterialInlet MaterialInlet TypePrice (inc. VAT)
ALF3007 1/21/2"3/8"Polysulfone250 psiSteelBuna NIronMale Threaded£51.96
BLF3007 3/43/4"1/2"Polysulfone-SteelBuna NIronMale Threaded£58.16
12

Dielectric Unions

Watts dielectric unions are used in HVAC equipment, hot water storage tanks, and piping system for reducing the deterioration and accelerated corrosion caused due to stray and galvanic currents. These unions are capable of withstanding temperatures and pressures up to 180 degrees F and 250 psi, respectively. They are offered in FIP, MIP & solder connection options, to allow easy installation on pipe sizes ranging from 1/2 to 4 inches, on Raptor Supplies.

Frequently Asked Questions

What is stray current?

Stray current produces a high number of anodes & cathodes that can inadvertently enter an alternate (but unintended) path and create corrosion in the piping system.

What is the function of tailpieces in a dielectric union?

Tailpieces allow connecting ends of two dissimilar pipe systems so that liquid can be safely transported with minimal leakage.

How does the dielectric union break continuity?

When dielectric unions are connected between two dissimilar pipes, they ground the electric current and break continuity for complete insulation between the two environments.

How to install a dielectric union between steel and copper pipes?

  • Wrap several layers of sealing tape over the threads of the steel pipe.
  • Connect the threaded end of the dielectric union to the steel pipe and turn it clockwise using a pipe wrench.
  • Slide the union nut over the end of the copper pipe and place the plastic insulator over the copper pipe.
  • Install the copper solder adapter onto the copper pipe and sweat adapter using a propane torch.
  • Allow the pipe to cool.
  • Quickly slide the rubber gasket between the union nut & body and assemble it.
  • Inspect to ensure a watertight connection.

We are here to help!

Looking for a part not listed here?