Dielectric Unions | Raptor Supplies United Kingdom

Dielectric Unions

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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.

StyleModelHex SizePipe SizePrice (inc. VAT)
A1/2 LF 3005-1/2A1.5"1/2"£16.32
A3/4 LF 3005-3/4A1.625"3/4"£20.54
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LF3001A Series Dielectric Unions

StyleModelGasket MaterialHex SizeInlet SizeOutlet SizePipe SizePrice (inc. VAT)
ALF3001A 3/4Buna-N-3/4"3/4"-£23.70
B1/2 LF 3001A-1/2"Buna-N1.5"--1/2"£17.75
B3/4 LF 3001A-3/4"Buna-N1.625"--3/4"£20.99
B1 LF 3001A-1"Buna-N1.875"--1"£31.27
B11/4 LF 3001A-1 1/4"Buna-N2.25"--1.25"£50.39
B11/2 LF 3001A-1 1/2"Buna-N2.75"--1.5"£70.18
B2 LF 3001A-2"Buna-N3.5"--2"£92.38
ALF3001A 1Buna-N-1"1"-£42.01
ALF3001A 2Buna-N-2"2"-£147.51
ALF3001A 1 1/2Buna-N-1-1/2"1-1/2"-£119.32
ALF3001A 1 1/4Buna-N-1-1/4"1-1/4"-£70.08
CLF3001A 1/2Buna N-1/2"1/2"-£24.96
ZURN -

DUXL Dielectric Pipe Fittings

StyleModelPrice (inc. VAT)
A112-DUXL£82.68
RFQ
A114-DUXL£57.45
RFQ
B1-DUXL£46.94
RFQ
A12-DUXL£24.18
RFQ
APPROVED VENDOR -

Dielectric Union, FIP x Solder

StyleModelPipe SizePrice (inc. VAT)
A2TFA21"£31.59
B2TFA31.5"£74.16
C2TEZ91/2"£15.81
D2TFA13/4"£17.22
StyleModelPipe SizePrice (inc. VAT)
A3200 22"£259.58
A3200 21/2"2.5"£285.24
A3200 3"3"£332.51
A3200 4"4"£508.51
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DUXLC Dielectric Pipe Fittings

StyleModelPrice (inc. VAT)
A212-DUXLC£215.10
RFQ
B114-DUXLC£57.45
RFQ
C12-DUXLC£24.18
RFQ
D1-DUXLC£46.94
RFQ
E34-DUXLC£26.62
RFQ
F3-DUXLC£251.18
RFQ
G112-DUXLC£82.68
RFQ
H2-DUXLC£158.70
RFQ
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LF3110 Series, Dielectric Flange, Solder

StyleModelPipe SizePrice (inc. VAT)
A2 1/2 LF31102.5"£597.43
B3 LF31103"£579.35
C4 LF31104"£669.96
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LF4001E Series Dielectric Unions

StyleModelGasket MaterialInlet SizeOutlet SizePrice (inc. VAT)
ALF4001E 2 1/2Buna-N2-1/2"2-1/2"£210.22
BLF4001E 3/4Buna-N3/4"3/4"£28.59
CLF4001E 1 1/2Buna N1 1/2"1-1/2"£149.80
CLF4001E 1 1/4Buna N1 1/4"1-1/4"£103.09
CLF4001E 1/2Buna N1/2"1/2"£28.59
CLF4001E 1Buna N1"1"£63.23
StyleModelInlet SizeOutlet SizePrice (inc. VAT)
ALF3005A 1/21/2"1/2"£23.05
ALF3005A 3/43/4"3/4"£21.95
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LF3006 Series Dielectric Unions

StyleModelPipe SizeBody MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet MaterialOutlet SizePrice (inc. VAT)
ALF3006 3/4--Buna-N-Steel3/4"Steel3/4"£45.92
ALF3006 1--Buna-N-Steel1"Steel1"£60.42
BLF3006 1 1/4--Buna N-Steel1 1/4"Steel1-1/4"£80.56
ALF3006 2--Buna-N-Malleable Iron2"Malleable Iron2"£181.23
BLF3006 1/2--Buna N-Malleable Iron1/2"Malleable Iron-£34.64
C1 LF30061"Malleable IronBuna-N2.25"----£41.82
D1 1/2 LF30061.5"Black Malleable IronBuna-N3.5"----£79.62
E11/4 LF30061.25"Malleable IronBuna-N2.75"----£57.00
F1/2 LF30061/2"Malleable IronBuna-N1.625"----£28.31
G2 LF30062"Black Malleable IronBuna-N4.125"----£166.87
H3/4 LF30063/4"Malleable IronBuna-N1.875"----£31.70
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LF301 Series Dielectric Unions

StyleModelInlet SizeOutlet SizePrice (inc. VAT)
ALF301 11"1"£15.24
ALF301 1 1/21-1/2"1-1/2"£35.66
ALF301 1 1/41-1/4"1-1/4"£23.43
BLF301 1/21/2"1/2"£9.42
ALF301 22"2"£49.52
ALF301 3/43/4"3/4"£9.46
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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 MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet MaterialOutlet SizePrice (inc. VAT)
ALF3004 1 1/4--Buna-N-Steel1-1/4"Steel1-1/4"£80.56
ALF3004 2--Buna-N-Malleable Iron2"Malleable Iron2"£181.23
BLF3004 1 1/2--Buna N-Malleable Iron1 1/2"Malleable Iron1-1/2"£122.43
BLF3004 1/2--Buna N-Steel1/2"Steel1/2"£40.26
BLF3004 1--Buna N-Steel1"Steel1"£60.42
ALF3004 3/4--Buna-N-Steel3/4"Steel3/4"£45.92
C1 LF 3004-11"Malleable Iron and Galvanized SteelBuna-N2.25"----£82.59
D11/2 LF30041.5"Galvanized Malleable IronBuna-N3.5"----£82.56
A1 1/4 LF30041.25"IronBuna-N2.75"----£61.96
C1/2 LF 3004-1/21/2"Malleable Iron and Galvanized SteelBuna-N1.625"----£42.49
E2 LF30042"Galvanized Malleable IronBuna-N4.125"----£131.62
C3/4 LF 3004 3/43/4"Malleable Iron and Galvanized SteelBuna-N1.875"----£48.47
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LF3002 Series Dielectric Unions

StyleModelInlet MaterialInlet SizeOutlet SizePrice (inc. VAT)
A1 LF3002---£36.47
BLF3002 3/4Iron3/4"1/2"£39.06
BLF3002 1Steel1"3/4"£56.79
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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.

StyleModelBody MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet SizePipe SizePrice (inc. VAT)
ALF3003 1/2-Buna-N-Steel1/2"1/2"-£54.76
ALF3003 3/4-Buna-N-Steel3/4"3/4"-£66.43
ALF3003 1 1/4-Buna-N-Steel1-1/4"1-1/4"-£152.21
ALF3003 1-Buna-N-Steel1"1"-£101.47
BLF3003 2-Buna N-Malleable Iron2"2"-£277.88
ALF3003 1 1/2-Buna-N-Malleable Iron1-1/2"1-1/2"-£209.42
C1 1/2 LF3003Lead Free Brass and Malleable IronBuna-N3.5"---1.5"£144.94
C2 LF3003Lead Free Brass and Malleable IronBuna-N4.125"---2"£171.69
C1/2 LF3003Lead Free Brass and SteelBuna-N1.625"---1/2"£36.47
C3/4 LF3003Lead Free Brass and SteelBuna-N1.875"---3/4"£44.27
C1 LF3003Lead Free Brass and SteelBuna-N2.25"---1"£56.30
D11/4 LF3003Lead Free Brass and SteelBuna-N2.75"---1.25"£103.95
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LF3008 Series Dielectric Unions

StyleModelGasket MaterialHex SizeInlet SizeOutlet SizePipe SizePrice (inc. VAT)
A1/2 LF3008Buna-N1.5"--1/2"£42.84
A3/4 LF3008Buna-N1.625"--3/4"£52.78
B1 LF3008Buna-N1.875"--1"£59.40
CLF3008 1/2Buna-N-1/2"1/2"-£55.16
CLF3008 3/4Buna-N-3/4"3/4"-£57.19
DLF3008 1Buna N-1"1"-£98.27
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Insulator Kits

StyleModelMfr. SeriesPrice (inc. VAT)
AINK-A-KITRK-3000£5.94
BINS-KIT 1/2RK-3100/3110/3200£8.17
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Dielectric Unions

StyleModelMfr. SeriesGasket MaterialInlet ConnectionOutlet ConnectionOutlet MaterialOutlet SizeOutlet TypeInlet MaterialPrice (inc. VAT)
A3001A 1/2-Buna NFemale ThreadedSocketBrass--Iron£19.56
RFQ
B3003 3/4-Buna NFemale ThreadedFemale ThreadedBrass--Iron£54.76
RFQ
C3004 1 1/4-Buna NFemale ThreadedFemale ThreadedGalvanized Iron--Iron£66.03
RFQ
C3004 1/2-Buna NFemale ThreadedFemale ThreadedGalvanized Iron--Iron£33.03
RFQ
D3001A 1 1/23001ABuna-N---1-1/2"SocketIron£98.03
D3001A 23001ABuna-N---2"SocketIron£121.17
D3001A 1 1/43001ABuna-N---1-1/4"SocketIron£57.47
EA3200 43200Buna NFemale ThreadedFemale ThreadedCast Iron4"Female ThreadedCast Iron£828.77
RFQ
EA3200 33200Buna NFemale ThreadedFemale ThreadedCast Iron3"Female ThreadedCast Iron£550.89
RFQ
EA3200 2 1/23200Buna NFemale ThreadedFemale ThreadedCast Iron2-1/2"Female ThreadedCast Iron£446.21
RFQ
FLF3007 3/4LF3007Buna-N--Lead Free Brass1/2"SocketIron£56.79
GLF3007 1/2LF3007Buna NMale ThreadedSocketLead Free Brass3/8"SocketIron£50.74
HLF3100M3 4LF3100Buna NFemale ThreadedSocketLead Free Brass4"SocketIron£1,605.19
RFQ
HLF3100M3 3LF3100Buna NFemale ThreadedSocketLead Free Brass3"SocketIron£606.48
RFQ
ILF3100M3 2 1/2LF3100Buna NFemale ThreadedSocketLead Free Brass2-1/2"SocketIron£442.18
RFQ
WATTS -

LF3100 Series, Dielectric Flange, FIP x Solder

StyleModelBody MaterialMax. PressurePipe SizePrice (inc. VAT)
A3 LF3100Copper and Iron175 psi3"£396.30
B2 1/2 LF3100Copper and Iron175 psi2.5"£354.92
C2 LF 3100 2"Malleable Iron and Brass250 psi2"£329.34
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Dielectric Union 3/4 x 1/2 Inch Fip x Solder

ModelItemPrice (inc. VAT)
3/4x1/2 LF 3002-3/4X1/2AE3JGP£19.91
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Dielectric Union Insulator Kit

ModelItemPrice (inc. VAT)
INK-F-KITCB7BYR£8.88
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Flange Bolt Insulator Kit

ModelItemPrice (inc. VAT)
INS-KIT 3/4CB4PGJ£10.38
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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.

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