WATTS Dielectric Unions

Used with water heaters for separating two metal pipes of different materials and to prevent galvanic corrosion. Available in different connection types

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Watts dielectric unions provide insulation between two different materials to prevent electrolysis which may lead to corrosion or pipe failure. Series LF3100 unions feature a female iron pipe...Read more
StyleModelHex SizePipe SizePrice
A1/2 LF 3005-1/2A1.5"1/2"€14.60
A3/4 LF 3005-3/4A1.625"3/4"€20.52
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
ALF3003 1 1/4-Buna-N-Steel1-1/4"1-1/4"-€149.76
ALF3003 1 1/2-Buna-N-Malleable Iron1-1/2"1-1/2"-€206.05
ALF3003 1-Buna-N-Steel1"1"-€99.84
BLF3003 2-Buna N-Malleable Iron2"2"-€273.42
ALF3003 1/2-Buna-N-Steel1/2"1/2"-€53.88
ALF3003 3/4-Buna-N-Steel3/4"3/4"-€65.37
C1 1/2 LF3003Lead Free Brass and Malleable IronBuna-N3.5"---1.5"€128.67
C2 LF3003Lead Free Brass and Malleable IronBuna-N4.125"---2"€152.41
C1/2 LF3003Lead Free Brass and SteelBuna-N1.625"---1/2"€31.89
D11/4 LF3003Lead Free Brass and SteelBuna-N2.75"---1.25"€90.91
C3/4 LF3003Lead Free Brass and SteelBuna-N1.875"---3/4"€38.72
C1 LF3003Lead Free Brass and SteelBuna-N2.25"---1"€49.98
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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.

StyleModelBody MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet MaterialOutlet SizePipe SizePrice
ALF3004 1 1/2-Buna N-Malleable Iron1 1/2"Malleable Iron1-1/2"-€120.46
BLF3004 3/4-Buna-N-Steel3/4"Steel3/4"-€45.18
BLF3004 2-Buna-N-Malleable Iron2"Malleable Iron2"-€178.32
ALF3004 1/2-Buna N-Steel1/2"Steel1/2"-€39.61
ALF3004 1-Buna N-Steel1"Steel1"-€59.45
BLF3004 1 1/4-Buna-N-Steel1-1/4"Steel1-1/4"-€79.26
C2 LF3004Galvanized Malleable IronBuna-N4.125"----2"€115.12
D11/2 LF3004Galvanized Malleable IronBuna-N3.5"----1.5"€81.23
B1 1/4 LF3004IronBuna-N2.75"----1.25"€55.01
E3/4 LF 3004 3/4Malleable Iron and Galvanized SteelBuna-N1.875"----3/4"€43.02
E1 LF 3004-1Malleable Iron and Galvanized SteelBuna-N2.25"----1"€82.48
E1/2 LF 3004-1/2Malleable Iron and Galvanized SteelBuna-N1.625"----1/2"€37.73
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Dielectric Unions

StyleModelGasket MaterialInlet ConnectionInlet MaterialInlet SizeInlet Thread TypeInlet TypeMax. Working PressureMfr. SeriesPrice
A3001A 1 1/2Buna-N-Iron1-1/2"-Female Threaded-3001A€96.45
A3001A 2Buna-N-Iron2"-Female Threaded-3001A€119.23
BLF3007 3/4Buna-N-Iron3/4"-Male Threaded-LF3007€55.88
A3001A 1 1/4Buna-N-Iron1-1/4"-Female Threaded-3001A€56.55
CLF3100M3 2 1/2Buna NFemale ThreadedIron2 1/2"NPTFemale Threaded175 PSILF3100€435.08
RFQ
DLF3100M3 4Buna NFemale ThreadedIron4"NPTFemale Threaded175 PSILF3100€1,579.41
RFQ
DLF3100M3 3Buna NFemale ThreadedIron3"NPTFemale Threaded175 PSILF3100€596.74
RFQ
E3004 1 1/4Buna NFemale ThreadedIron1 1/4"NPT-250 PSI-€64.97
RFQ
E3004 1/2Buna NFemale ThreadedIron1/2"NPT-250 PSI-€32.50
RFQ
FA3200 4Buna NFemale ThreadedCast Iron4"NPTFemale Threaded175 PSI3200€815.46
RFQ
GLF3007 1/2Buna NMale ThreadedIron1/2"IPSMale Threaded250 PSILF3007€49.92
H3001A 1/2Buna NFemale ThreadedIron1/2"NPT-250 PSI-€19.25
RFQ
I3003 3/4Buna NFemale ThreadedIron3/4"NPT-250 PSI-€53.88
RFQ
FA3200 3Buna NFemale ThreadedCast Iron3"NPTFemale Threaded175 PSI3200€542.04
RFQ
FA3200 2 1/2Buna NFemale ThreadedCast Iron2 1/2"NPTFemale Threaded175 PSI3200€439.04
RFQ
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Insulator Kits

StyleModelMfr. SeriesPrice
AINK-A-KITRK-3000€5.84
BINS-KIT 1/2RK-3100/3110/3200€8.04
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LF3100 Series, Dielectric Flange, FIP x Solder

StyleModelBody MaterialMax. PressurePipe SizePrice
A2 1/2 LF3100Copper and Iron175 psi2.5"€310.42
B3 LF3100Copper and Iron175 psi3"€391.99
C2 LF 3100 2"Malleable Iron and Brass250 psi2"€288.04
StyleModelPipe SizePrice
A3200 22"€227.03
A3200 21/2"2.5"€249.48
A3200 3"3"€290.82
A3200 4"4"€444.75
StyleModelInlet SizeOutlet SizePrice
ALF3005A 1/21/2"1/2"€22.68
ALF3005A 3/43/4"3/4"€21.60
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LF3001A Series Dielectric Unions

StyleModelGasket MaterialHex SizeInlet SizeOutlet SizePipe SizePrice
A1 LF 3001A-1"Buna-N1.875"--1"€27.77
A11/4 LF 3001A-1 1/4"Buna-N2.25"--1.25"€50.32
A2 LF 3001A-2"Buna-N3.5"--2"€82.00
BLF3001A 2Buna-N-2"2"-€145.14
A1/2 LF 3001A-1/2"Buna-N1.5"--1/2"€17.74
A3/4 LF 3001A-3/4"Buna-N1.625"--3/4"€18.64
A11/2 LF 3001A-1 1/2"Buna-N2.75"--1.5"€62.31
BLF3001A 1Buna-N-1"1"-€41.34
BLF3001A 1 1/2Buna-N-1-1/2"1-1/2"-€117.40
BLF3001A 1 1/4Buna-N-1-1/4"1-1/4"-€68.95
BLF3001A 3/4Buna-N-3/4"3/4"-€23.32
CLF3001A 1/2Buna N-1/2"1/2"-€24.56
WATTS -

LF3006 Series Dielectric Unions

StyleModelBody MaterialGasket MaterialHex SizeInlet MaterialInlet SizeOutlet MaterialOutlet SizePipe SizePrice
ALF3006 2-Buna-N-Malleable Iron2"Malleable Iron2"-€178.32
ALF3006 3/4-Buna-N-Steel3/4"Steel3/4"-€45.18
ALF3006 1-Buna-N-Steel1"Steel1"-€59.45
BLF3006 1 1/4-Buna N-Steel1 1/4"Steel1-1/4"-€79.26
BLF3006 1/2-Buna N-Malleable Iron1/2"Malleable Iron--€34.08
C1 1/2 LF3006Black Malleable IronBuna-N3.5"----1.5"€71.19
D2 LF3006Black Malleable IronBuna-N4.125"----2"€164.19
E1/2 LF3006Malleable IronBuna-N1.625"----1/2"€27.86
F11/4 LF3006Malleable IronBuna-N2.75"----1.25"€56.08
G3/4 LF3006Malleable IronBuna-N1.875"----3/4"€31.19
H1 LF3006Malleable IronBuna-N2.25"----1"€41.15
WATTS -

LF301 Series Dielectric Unions

StyleModelInlet SizeOutlet SizePrice
ALF301 11"1"€14.99
ALF301 1 1/21-1/2"1-1/2"€35.08
ALF301 1 1/41-1/4"1-1/4"€23.05
BLF301 1/21/2"1/2"€9.27
ALF301 22"2"€48.73
ALF301 3/43/4"3/4"€9.31
WATTS -

LF4001E Series Dielectric Unions

StyleModelGasket MaterialInlet SizeOutlet SizePrice
ALF4001E 2 1/2Buna-N2-1/2"2-1/2"€206.84
BLF4001E 3/4Buna-N3/4"3/4"€28.13
CLF4001E 1/2Buna N1/2"1/2"€28.13
CLF4001E 1 1/2Buna N1 1/2"1-1/2"€147.39
CLF4001E 1Buna N1"1"€62.21
CLF4001E 1 1/4Buna N1 1/4"1-1/4"€101.43
WATTS -

LF3110 Series, Dielectric Flange, Solder

StyleModelPipe SizePrice
A2 1/2 LF31102.5"€587.83
B3 LF31103"€506.70
C4 LF31104"€607.93
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LF3002 Series Dielectric Unions

StyleModelInlet MaterialInlet SizeOutlet SizePrice
A1 LF3002---€31.35
BLF3002 3/4Iron3/4"1/2"€38.44
BLF3002 1Steel1"3/4"€55.88
WATTS -

LF3008 Series Dielectric Unions

StyleModelGasket MaterialHex SizeInlet SizeOutlet SizePipe SizePrice
ALF3008 1/2Buna-N-1/2"1/2"-€54.27
B3/4 LF3008Buna-N1.625"--3/4"€51.93
C1 LF3008Buna-N1.875"--1"€52.72
B1/2 LF3008Buna-N1.5"--1/2"€39.16
ALF3008 3/4Buna-N-3/4"3/4"-€56.27
DLF3008 1Buna N-1"1"-€96.69
WATTS -

Dielectric Union 3/4 x 1/2 Inch Fip x Solder

ModelItemPrice (ex. VAT)
3/4x1/2 LF 3002-3/4X1/2AE3JGP€20.03
WATTS -

Flange Bolt Insulator Kit

ModelItemPrice (ex. VAT)
INS-KIT 7/8CB4PGH€10.21
WATTS -

Dielectric Union Insulator Kit

ModelItemPrice (ex. VAT)
INK-B-KITCB7BYU€5.84
WATTS -

Flange Bolt Insulator Kit

ModelItemPrice (ex. VAT)
INS-KIT 5/8CB4PGG€9.13
WATTS -

Dielectric Union Insulator Kit

ModelItemPrice (ex. VAT)
INK-D-KITBZ2VAV€6.57
WATTS -

Dielectric Union Insulator Kit

ModelItemPrice (ex. VAT)
INK-F-KITCB7BYR€8.74
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Features

  • These unions are ideal for hot water storage tanks, water & air conditioners, steam, gas and water piping.
  • They are made of iron / brass / copper / steel for easy connection between two different pipes to prevent leakage, corrosion or deterioration in the piping system due to galvanic and stray current.
  • They are integrated with a Buna-N gasket for preventing the occurrence of electric current through the pipes.
  • They withstand a pressure rating of 175 / 250 psi and have a maximum temperature rating of 180 degrees F.

Frequently Asked Questions

Can a dielectric union be used between stainless steel and copper pipes?

When copper is used with carbon steel or galvanised steel, dielectric unions must be used to electrically insulate each material. But when copper is connected with stainless steel, a brass / bronze fitting can provide sufficient electrical separation between the two materials.

How does the dielectric union break continuity?

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

How to install the Watts dielectric union?

  • Wrap several layers of sealing tape over the threads of the steel pipe.
  • Install the threaded end of the dielectric union to the steel pipe and turn it clockwise with the help of a pipe wrench.
  • Next, slide the union nut over the end of the copper pipe with an open threaded end facing out. Also, slide 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.
  • Slide the rubber gasket between the union nut and the union body and assemble it.
  • Inspect to ensure a watertight connection.