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. GST)
A1/2 LF 3005-1/2A1.5"1/2" SGD 25.36
A3/4 LF 3005-3/4A1.625"3/4" SGD 31.92
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.

StyleModelBody MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet SizePipe SizePrice (inc. GST)
ALF3003 1/2-Buna-N-Steel1/2"1/2"- SGD 85.10
ALF3003 1 1/2-Buna-N-Malleable Iron1-1/2"1-1/2"- SGD 325.44
ALF3003 3/4-Buna-N-Steel3/4"3/4"- SGD 103.24
ALF3003 1 1/4-Buna-N-Steel1-1/4"1-1/4"- SGD 236.53
ALF3003 1-Buna-N-Steel1"1"- SGD 157.69
BLF3003 2-Buna N-Malleable Iron2"2"- SGD 431.84
C2 LF3003Lead Free Brass and Malleable IronBuna-N4.125"---2" SGD 266.80
C1 1/2 LF3003Lead Free Brass and Malleable IronBuna-N3.5"---1.5" SGD 225.24
C1/2 LF3003Lead Free Brass and SteelBuna-N1.625"---1/2" SGD 56.67
C3/4 LF3003Lead Free Brass and SteelBuna-N1.875"---3/4" SGD 68.80
C1 LF3003Lead Free Brass and SteelBuna-N2.25"---1" SGD 87.49
D11/4 LF3003Lead Free Brass and SteelBuna-N2.75"---1.25" SGD 161.53
WATTS -

Insulator Kits

StyleModelMfr. SeriesPrice (inc. GST)
AINK-A-KITRK-3000 SGD 9.22
BINS-KIT 1/2RK-3100/3110/3200 SGD 12.69
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 MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet MaterialOutlet SizePrice (inc. GST)
ALF3004 1 1/4--Buna-N-Steel1-1/4"Steel1-1/4" SGD 125.19
ALF3004 2--Buna-N-Malleable Iron2"Malleable Iron2" SGD 281.64
BLF3004 1 1/2--Buna N-Malleable Iron1 1/2"Malleable Iron1-1/2" SGD 190.26
BLF3004 1/2--Buna N-Steel1/2"Steel1/2" SGD 62.56
BLF3004 1--Buna N-Steel1"Steel1" SGD 93.89
ALF3004 3/4--Buna-N-Steel3/4"Steel3/4" SGD 71.35
C1 LF 3004-11"Malleable Iron and Galvanized SteelBuna-N2.25"---- SGD 128.35
D11/2 LF30041.5"Galvanized Malleable IronBuna-N3.5"---- SGD 128.29
A1 1/4 LF30041.25"IronBuna-N2.75"---- SGD 96.29
C1/2 LF 3004-1/21/2"Malleable Iron and Galvanized SteelBuna-N1.625"---- SGD 66.03
E2 LF30042"Galvanized Malleable IronBuna-N4.125"---- SGD 204.54
C3/4 LF 3004 3/43/4"Malleable Iron and Galvanized SteelBuna-N1.875"---- SGD 75.32
WATTS -

LF3002 Series Dielectric Unions

StyleModelInlet MaterialInlet SizeOutlet SizePrice (inc. GST)
A1 LF3002--- SGD 56.67
BLF3002 3/4Iron3/4"1/2" SGD 60.70
BLF3002 1Steel1"3/4" SGD 88.26
WATTS -

LF3008 Series Dielectric Unions

StyleModelGasket MaterialHex SizeInlet SizeOutlet SizePipe SizePrice (inc. GST)
A1/2 LF3008Buna-N1.5"--1/2" SGD 66.57
A3/4 LF3008Buna-N1.625"--3/4" SGD 82.01
B1 LF3008Buna-N1.875"--1" SGD 92.31
CLF3008 1/2Buna-N-1/2"1/2"- SGD 85.72
CLF3008 3/4Buna-N-3/4"3/4"- SGD 88.87
DLF3008 1Buna N-1"1"- SGD 152.71
APPROVED VENDOR -

Dielectric Union, FIP x Solder

StyleModelPipe SizePrice (inc. GST)
A2TFA21" SGD 49.08
B2TFA31.5" SGD 115.25
C2TEZ91/2" SGD 24.57
D2TFA13/4" SGD 26.76
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Dielectric Unions

StyleModelMfr. SeriesGasket MaterialInlet ConnectionOutlet ConnectionOutlet MaterialOutlet SizeOutlet TypeInlet MaterialPrice (inc. GST)
A3001A 1/2-Buna NFemale ThreadedSocketBrass--Iron SGD 30.40
RFQ
B3004 1 1/4-Buna NFemale ThreadedFemale ThreadedGalvanized Iron--Iron SGD 102.62
RFQ
C3003 3/4-Buna NFemale ThreadedFemale ThreadedBrass--Iron SGD 85.10
RFQ
B3004 1/2-Buna NFemale ThreadedFemale ThreadedGalvanized Iron--Iron SGD 51.33
RFQ
D3001A 1 1/23001ABuna-N---1-1/2"SocketIron SGD 152.33
D3001A 1 1/43001ABuna-N---1-1/4"SocketIron SGD 89.31
D3001A 23001ABuna-N---2"SocketIron SGD 188.31
EA3200 33200Buna NFemale ThreadedFemale ThreadedCast Iron3"Female ThreadedCast Iron SGD 856.09
RFQ
EA3200 2 1/23200Buna NFemale ThreadedFemale ThreadedCast Iron2-1/2"Female ThreadedCast Iron SGD 693.41
RFQ
EA3200 43200Buna NFemale ThreadedFemale ThreadedCast Iron4"Female ThreadedCast Iron SGD 1287.92
RFQ
FLF3007 1/2LF3007Buna NMale ThreadedSocketLead Free Brass3/8"SocketIron SGD 78.84
GLF3007 3/4LF3007Buna-N--Lead Free Brass1/2"SocketIron SGD 88.26
HLF3100M3 2 1/2LF3100Buna NFemale ThreadedSocketLead Free Brass2-1/2"SocketIron SGD 687.16
RFQ
ILF3100M3 4LF3100Buna NFemale ThreadedSocketLead Free Brass4"SocketIron SGD 2494.50
RFQ
ILF3100M3 3LF3100Buna NFemale ThreadedSocketLead Free Brass3"SocketIron SGD 942.49
RFQ
WATTS -

LF4001E Series Dielectric Unions

StyleModelGasket MaterialInlet SizeOutlet SizePrice (inc. GST)
ALF4001E 2 1/2Buna-N2-1/2"2-1/2" SGD 326.68
BLF4001E 3/4Buna-N3/4"3/4" SGD 44.42
CLF4001E 1/2Buna N1/2"1/2" SGD 44.42
CLF4001E 1Buna N1"1" SGD 98.25
CLF4001E 1 1/2Buna N1 1/2"1-1/2" SGD 232.79
CLF4001E 1 1/4Buna N1 1/4"1-1/4" SGD 160.20
StyleModelInlet SizeOutlet SizePrice (inc. GST)
ALF3005A 1/21/2"1/2" SGD 35.82
ALF3005A 3/43/4"3/4" SGD 34.11
WATTS -

LF3001A Series Dielectric Unions

StyleModelGasket MaterialHex SizeInlet SizeOutlet SizePipe SizePrice (inc. GST)
A1/2 LF 3001A-1/2"Buna-N1.5"--1/2" SGD 27.59
A3/4 LF 3001A-3/4"Buna-N1.625"--3/4" SGD 32.62
A1 LF 3001A-1"Buna-N1.875"--1" SGD 48.60
A11/4 LF 3001A-1 1/4"Buna-N2.25"--1.25" SGD 78.30
A11/2 LF 3001A-1 1/2"Buna-N2.75"--1.5" SGD 109.06
A2 LF 3001A-2"Buna-N3.5"--2" SGD 143.56
BLF3001A 1Buna-N-1"1"- SGD 65.29
BLF3001A 2Buna-N-2"2"- SGD 229.23
BLF3001A 1 1/2Buna-N-1-1/2"1-1/2"- SGD 185.43
BLF3001A 1 1/4Buna-N-1-1/4"1-1/4"- SGD 108.90
BLF3001A 3/4Buna-N-3/4"3/4"- SGD 36.84
CLF3001A 1/2Buna N-1/2"1/2"- SGD 38.79
WATTS -

LF3006 Series Dielectric Unions

StyleModelPipe SizeBody MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet MaterialOutlet SizePrice (inc. GST)
ALF3006 3/4--Buna-N-Steel3/4"Steel3/4" SGD 71.35
BLF3006 1 1/4--Buna N-Steel1 1/4"Steel1-1/4" SGD 125.19
ALF3006 2--Buna-N-Malleable Iron2"Malleable Iron2" SGD 281.64
ALF3006 1--Buna-N-Steel1"Steel1" SGD 93.89
BLF3006 1/2--Buna N-Malleable Iron1/2"Malleable Iron- SGD 53.83
C1 LF30061"Malleable IronBuna-N2.25"---- SGD 64.99
D1 1/2 LF30061.5"Black Malleable IronBuna-N3.5"---- SGD 123.73
E11/4 LF30061.25"Malleable IronBuna-N2.75"---- SGD 88.57
F1/2 LF30061/2"Malleable IronBuna-N1.625"---- SGD 44.00
G2 LF30062"Black Malleable IronBuna-N4.125"---- SGD 259.31
H3/4 LF30063/4"Malleable IronBuna-N1.875"---- SGD 49.26
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LF301 Series Dielectric Unions

StyleModelInlet SizeOutlet SizePrice (inc. GST)
ALF301 11"1" SGD 23.68
ALF301 1 1/21-1/2"1-1/2" SGD 55.41
ALF301 1 1/41-1/4"1-1/4" SGD 36.40
BLF301 1/21/2"1/2" SGD 14.64
ALF301 22"2" SGD 76.96
ALF301 3/43/4"3/4" SGD 14.70
ZURN -

DUXLC Dielectric Pipe Fittings

StyleModelPrice (inc. GST)
A112-DUXLC SGD 128.48
RFQ
B114-DUXLC SGD 89.28
RFQ
C12-DUXLC SGD 37.57
RFQ
D1-DUXLC SGD 72.94
RFQ
E212-DUXLC SGD 334.27
RFQ
F2-DUXLC SGD 246.62
RFQ
G34-DUXLC SGD 41.37
RFQ
H3-DUXLC SGD 390.34
RFQ
ZURN -

DUXL Dielectric Pipe Fittings

StyleModelPrice (inc. GST)
A112-DUXL SGD 128.48
RFQ
A114-DUXL SGD 89.28
RFQ
A12-DUXL SGD 37.57
RFQ
B1-DUXL SGD 72.94
RFQ
StyleModelPipe SizePrice (inc. GST)
A3200 22" SGD 403.40
A3200 21/2"2.5" SGD 443.27
A3200 3"3" SGD 516.73
A3200 4"4" SGD 790.23
WATTS -

LF3100 Series, Dielectric Flange, FIP x Solder

StyleModelBody MaterialMax. PressurePipe SizePrice (inc. GST)
A2 1/2 LF3100Copper and Iron175 psi2.5" SGD 551.56
B3 LF3100Copper and Iron175 psi3" SGD 615.85
C2 LF 3100 2"Malleable Iron and Brass250 psi2" SGD 511.80
WATTS -

LF3110 Series, Dielectric Flange, Solder

StyleModelPipe SizePrice (inc. GST)
A2 1/2 LF31102.5" SGD 928.41
B3 LF31103" SGD 900.32
C4 LF31104" SGD 1041.13
WATTS -

Dielectric Union Insulator Kit

ModelItemPrice (inc. GST)
INK-F-KITCB7BYR SGD 13.81
WATTS -

Dielectric Union Gasket and Insulator Kit

ModelItemPrice (inc. GST)
KIT GA-NCB4PGL SGD 53.03
WATTS -

Flange Bolt Insulator Kit

ModelItemPrice (inc. GST)
INS-KIT 3/4CB4PGJ SGD 16.13
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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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