Dielectric Unions

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<p>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. </p>
StyleModelFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeNut Material FinishMax. PressureMax. Operating PressureInsulator MaterialFitting Side A MaterialTemp.Price
A1/2 LF 3005-1/2A1/2"1/2"Zinc Plated250 psi250 psiPolysulfoneBrass33°F to 180°F€23.76
A3/4 LF 3005-3/4A3/4"3/4"Zinc Plated250 psi250 psiPolysulfoneBrass33°F to 180°F€28.27
WATTS -

LF3007 Series Dielectric Unions

StyleModelOutlet SizeMax. PressureNut MaterialInlet TypeInlet MaterialAdapter MaterialOutlet MaterialOutlet TypePrice
ALF3007 3/41/2"250 psiSteelMale ThreadedIronSteelLead Free BrassSocket€56.45
BLF3007 1/23/8"250 psiSteelMale ThreadedIronSteelLead Free BrassSocket€50.43
WATTS -

LF301 Series Dielectric Unions

StyleModelOutlet SizeMax. PressureNut MaterialInlet TypeAdapter MaterialOutlet MaterialOutlet TypeInsulation MaterialPrice
ALF301 1 1/21 1/2"250 psiSteelFemale ThreadedSteelLead Free BrassSocketPlastic€35.44
ALF301 1 1/41 1/4"250 psiSteelFemale ThreadedSteelLead Free BrassSocketPlastic€23.28
ALF301 11"250 psiSteelFemale ThreadedSteelLead Free BrassSocketPlastic€15.15
BLF301 1/21/2"250 psiSteelFemale ThreadedSteelLead Free BrassSocketPlastic€16.35
ALF301 22"250 psiSteelFemale ThreadedSteelLead Free BrassSocketPlastic€49.22
ALF301 3/43/4"250 psiSteelFemale ThreadedSteelLead Free BrassSocketPlastic€27.42
WATTS -

LF4001E Series Dielectric Unions

StyleModelNut MaterialOutlet SizeMax. PressureInlet TypeInlet MaterialAdapter MaterialOutlet MaterialOutlet TypePrice
ALF4001E 2Malleable Iron2 1/2"250 psiFemale ThreadedSteelSteelLead Free BrassSocket€208.95
BLF4001E 1 1/2Malleable Iron1 1/2"250 psiFemale ThreadedSteelSteelLead Free BrassSocket€148.90
BLF4001E 1/2Steel1/2"250 psiFemale ThreadedSteelSteelLead Free BrassSocket€28.41
CLF4001E 3/4Steel3/4"250 psiFemale ThreadedSteelSteelLead Free BrassSocket€28.41
BLF4001E 1Steel1"250 psiFemale ThreadedSteelSteelLead Free BrassSocket€62.85
BLF4001E 1 1/4Steel1 1/4"250 psiFemale ThreadedSteelSteelLead Free BrassSocket€102.47
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.

StyleModelNut MaterialInlet MaterialAdapter MaterialFitting Side A MaterialFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeOutlet MaterialFitting Side B MaterialPrice
A1/2 LF 3004-1/2---Steel1/2"1/2"-Steel€49.01
A3/4 LF 3004 3/4---Steel3/4"3/4"-Steel€55.91
A1 LF 3004-1---Steel1"1"-Steel€118.54
B2 LF3004---Malleable Iron2"2"-Malleable Iron€186.13
C11/2 LF3004---Malleable Iron1 1/2"1 1/2"-Malleable Iron€93.82
DLF3004 1 1/2Malleable IronMalleable IronMalleable Iron---Malleable Iron-€121.69
ELF3004 1 1/4Malleable IronSteelSteel---Steel-€80.07
DLF3004 1/2SteelSteelSteel---Steel-€40.02
DLF3004 1SteelSteelSteel---Steel-€60.05
ELF3004 3/4SteelSteelSteel---Steel-€45.64
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DUXL Dielectric Pipe Fittings

StyleModelApplicationTypeSpecific Fitting ShapeBasic Pipe Fitting ShapePrice
A1-DUXL-Dielectric Pipe UnionDielectric UnionUnion€73.32
B114-DUXLPotablewater---€89.73
B112-DUXLPotablewater---€129.14
B12-DUXLPotablewaterDielectric Pipe UnionDielectric UnionUnion€37.76
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LF3110 Series Dielectric Unions

StyleModelFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeFitting Side A Flange Dia.Fitting Side B Flange Dia.Max. PressureMax. Operating PressureInsulator MaterialFitting Side A MaterialPrice
ALF3110-LF 3----175 psi175 psi--€725.31
RFQ
BLF3110 2 1/22 1/2"2 1/2"7"7"175 psi175 psiPolysulfoneCopper Silicone Alloy€788.52
C3 LF31103"3"7 1/2"7 1/2"175 psi175 psiPolysulfoneCopper Silicone Alloy€658.34
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LF3100 Series Dielectric Unions

StyleModelOutlet SizeMax. PressureNut MaterialInlet TypeInlet MaterialAdapter MaterialOutlet MaterialOutlet TypePrice
ALF3100M3 2 1/22 1/2"175 psiSteelFemale ThreadedIronCast IronLead Free BrassSocket€439.52
RFQ
BLF3100M3 33"175 psiSteelFemale ThreadedIronCast IronLead Free BrassSocket€602.83
RFQ
BLF3100M3 44"175 psiSteelFemale ThreadedIronCast IronLead Free BrassSocket€1,595.52
RFQ
WATTS -

RK-3000 Series Dielectric Union Repair Kit

StyleModelKit TypeKit ContentsMfr. SeriesLead FreeBuy American Act CompliantAda CompliantSeriesPrice
AKIT GA-H-------€6.63
BKIT GB-C-------€15.86
CKIT GB-E-------€26.18
DKIT GA-D-------€8.12
EKIT GA-C-------€6.63
FKIT GB-D-------€21.40
GKIT GB-A-------€11.80
HKIT GA-J-------€6.63
IKIT GA-G-------€5.90
JKIT GB-F-------€40.91
KKIT GA-FGasket Kit2 GA Gaskets Per KitRK-3000 Series----€10.69
LKIT GA-EGasket Kit-RK-3000 Series----€8.47
MKIT GB-BGasket Kit2 GB Gaskets Per KitRK-3000 Series----€13.29
NKIT GA-AGasket Kit2 GA Gaskets Per KitRK-3000 Series----€5.50
OKIT GA-QGasket Kit2 GA Gaskets Per KitRK-3000 Series----€41.30
PKIT GA-MGasket Kit2 GA Gaskets Per KitRK-3000 Series----€15.86
QKIT GA-LGasket Kit2 GA Gaskets Per KitRK-3000 Series----€12.53
RKIT GA-RGasket Kit2 GA Gaskets Per KitRK-3000 Series----€36.14
SKIT GA-PGasket Kit2 GA Gaskets Per KitRK-3000 Series----€36.14
TKIT GA-BGasket Kit2 GA Gaskets Per KitRK-3000 Series----€4.53
UINK-A-KITInsulator Kit2 Insulators Per Kit-Yes--RK-3000 Series€5.90
VINK-C-KITInsulator Kit2 Insulators Per KitRK-3000 SeriesYesNoNo-€6.63
WINK-J-KITInsulator Kit8 Insulators Per KitRK-3000 SeriesYes-No-€42.77
XINK-B-KITInsulator Kit2 Insulators Per Kit-YesNo-RK-3000 Series€5.90
YINK-F-KITInsulator Kit2 Insulators Per Kit-Yes--RK-3000 Series€8.83
WATTS -

LF3008 Series Dielectric Unions

StyleModelFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeHex SizeMax. PressureNut MaterialMax. Operating PressureInsulator MaterialFitting Side A MaterialPrice
ALF3008 3/4---250 psiBrass---€56.85
B1 LF30081"1"1 7/8"250 psiBrass250 psiPolysulfoneBrass€70.70
C1/2 LF30081/2"1/2"1 1/2"250 psiBrass250 psiPolysulfoneBrass€63.75
StyleModelSizeEnd ConnectionPrice
A701-4071 1/2"FIP€30.20
RFQ
A701-4061 1/4"FIP€20.28
RFQ
A701-4051"FIP€13.53
RFQ
A701-4031/2"FIP€6.02
RFQ
A701-4082"FIP€48.79
RFQ
A701-4043/4"FIP€7.94
RFQ
StyleModelSizeEnd ConnectionPrice
A701-4171 1/2"FIP€31.89
RFQ
A701-4161 1/4"FIP€21.19
RFQ
A701-4151"FIP€13.94
RFQ
A701-4131/2"FIP€6.38
RFQ
A701-4182"FIP€51.47
RFQ
A701-4143/4"FIP€8.56
RFQ
StyleModelSizeEnd ConnectionPrice
A701-1071 1/2"FIP x Solder€19.72
RFQ
A701-1061 1/4"FIP x Solder€13.31
RFQ
A701-1051"FIP x Solder€8.91
RFQ
A701-1031/2"FIP x Solder€5.09
RFQ
A701-1082"FIP x Solder€31.66
RFQ
A701-1043/4"FIP x Solder€6.11
RFQ
MUELLER STREAMLINE -

PRS Dielectric Unions

StyleModelMin. Operating Temp.Price
APF 11503-20°F€100.89
APF 11504-21°F€108.10
APF 11505-22°F€138.68
APF 11506-23°F€179.03
APF 11507-24°F€208.28
APF 11508-25°F€292.25
APPROVED VENDOR -

Dielectric Union, FIP x Solder

StyleModelFitting Side A MaterialFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeHex SizeFitting Side A Outside Dia.Fitting Side A Pipe ThreadingFitting Side B Outside Dia.Max. PressurePrice
A168-003NLIron1/2"1/2"1 3/8"1"143/4"250 psi€22.68
B168-004NLIron3/4"3/4"1 9/16"1 3/16"141"250 psi€24.68
C168-005NLSteel1"1"1 15/16"1 1/2"11 1/2"1 1/4"250 psi€45.33
D168-007NLSteel1 1/2"1 1/2"2 3/4"2 1/8"11 1/2"1 3/4"250 psi€106.16
WATTS -

LF3002 Series Dielectric Unions

StyleModelNut Material FinishMax. PressureNut MaterialInlet TypeInlet MaterialMax. Operating PressureAdapter MaterialInsulator MaterialPrice
ALF3002 3/4-250 psiSteelFemale ThreadedIron-Steel-€38.83
B1 LF3002Zinc Plated250 psi---250 psi-Polysulfone€44.69
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DUXLC Dielectric Pipe Fittings

StyleModelSizeTypeBasic Pipe Fitting ShapeSpecific Fitting ShapePrice
A212-DUXLC----€606.77
B112-DUXLC1 1/2" FNPTDielectric Pipe Union--€129.14
C114-DUXLC1 1/4" FNPTDielectric Pipe UnionUnion-€89.73
D1-DUXLC1" FNPTDielectric Pipe UnionUnion-€114.55
E12-DUXLC1/2" FNPTDielectric Pipe UnionUnionDielectric Union€37.76
F2-DUXLC2" FNPTDielectric Pipe UnionUnionDielectric Union€247.89
G3-DUXLC3" FNPTDielectric Pipe Union--€392.34
H34-DUXLC3/4" FNPTDielectric Pipe Union--€41.58
StyleModelSizeEnd ConnectionPrice
A701-505G1"FIP€20.70
RFQ
A701-503G1/2"FIP€9.70
RFQ
A701-504G3/4"FIP€13.58
RFQ
WATTS -

LF3100 Series, Dielectric Flange, FIP x Solder

StyleModelMax. PressureFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizePipe Fitting MaterialFitting Side A Flange Dia.Fitting Side B Flange Dia.Max. Operating PressureInsulator MaterialPrice
A2 1/2 LF3100175 psi2 1/2"2 1/2"Copper, Iron5 7/8"5 7/8"175 psiPolysulfone€461.12
B3 LF3100175 psi3"3"Copper, Iron6 3/4"6 3/4"175 psiPolysulfone€462.14
C2 LF 3100 2 250 psi2"2"Brass, Malleable Iron5 1/8"-175 psiPolysulfone€471.54
WATTS -

LF3001A Series Dielectric Unions

StyleModelFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeOutlet SizeFitting Side A TypeFitting Side B TypeHex SizeMax. PressureInlet TypePrice
ALF3001A 1--1"---250 psiFemale Threaded€41.76
ALF3001A 2--2"---250 psiFemale Threaded€146.62
ALF3001A 1 1/2--1 1/2"---250 psiFemale Threaded€118.60
ALF3001A 1 1/4--1 1/4"---250 psiFemale Threaded€69.66
BLF3001A 1/2--1/2"---250 psiFemale Threaded€38.78
ALF3001A 3/4--3/4"---250 psiFemale Threaded€23.56
C11/2 LF 3001A-1 1/2 1 1/2"1 1/2"-NPTSolder2 3/4"250 psi-€80.95
C11/4 LF 3001A-1 1/4 1 1/4"1 1/4"-NPTSolder2 1/4"250 psi-€60.28
C1 LF 3001A-1 1"1"-NPTSolder1 7/8"250 psi-€36.08
C1/2 LF 3001A-1/2 1/2"1/2"-Female ThreadedSocket-250 psi-€20.48
C2 LF 3001A-2 2"2"-NPTSolder3 1/2"250 psi-€106.53
C3/4 LF 3001A-3/4 3/4"3/4"-NPTSolder-250 psi-€24.23
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.

StyleModelFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeFitting Side B MaterialHex SizeNut Material FinishFitting Side B TypeInlet MaterialAdapter MaterialPrice
ALF3003 1 1/4------SteelSteel€280.36
BLF3003 2------Malleable IronMalleable Iron€340.56
CLF3003 1 1/21 1/2"1 1/2"Malleable Iron3 1/2"Galvanized Malleable IronNPT--€218.43
CLF3003 11"1"Steel2 1/4"Zinc PlatedFbp--€64.93
C1/2 LF30031/2"1/2"Steel1 5/8"Zinc PlatedNPT--€41.44
C3/4 LF30033/4"3/4"Steel1 7/8"Zinc PlatedNPT--€50.32
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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.