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

Filter

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
WATTS -

LF3002 Series Dielectric Unions

StyleModelPipe SizeConnection TypeInsulation MaterialBody MaterialGasket MaterialMax. PressureApplicationAdapter MaterialPrice
ALF3002 3/4--Polysulfone-Buna N250 psi-Steel€38.83
B1 LF30021"FIP x Solder-Copper, IronBuna N250 psiNon-Potable Water, Steam-€44.69
WATTS -

LF4001E Series Dielectric Unions

StyleModelInlet SizeNut MaterialOutlet SizeInsulation MaterialMax. Working PressureAdapter MaterialGasket MaterialInlet MaterialPrice
ALF4001E 1 1/21 1/2"Malleable Iron1 1/2"Polysulfone250 psiSteelBuna NSteel€148.90
ALF4001E 1 1/41 1/4"Steel1 1/4"Polysulfone250 psiSteelBuna NSteel€102.47
ALF4001E 11"Steel1"Polysulfone250 psiSteelBuna NSteel€62.85
ALF4001E 1/21/2"Steel1/2"Polysulfone250 psiSteelBuna NSteel€28.41
BLF4001E 22 1/2"Malleable Iron2 1/2"Polysulfone-SteelBuna NSteel€208.95
CLF4001E 3/43/4"Steel3/4"Polysulfone-SteelBuna NSteel€28.41
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 SizeFitting Side A Nominal Pipe SizeFitting Side B MaterialFitting Side B Nominal Pipe SizeFitting Side B TypeHex SizeOverall LengthAdapter MaterialPrice
ALF3003 1 1/4-------Steel€280.36
BLF3003 2-------Malleable Iron€340.56
CLF3003 1 1/21 1/2"1 1/2"Malleable Iron1 1/2"NPT3 1/2"2 3/4"-€218.43
CLF3003 11"1"Steel1"Fbp2 1/4"2 1/2"-€64.93
C1/2 LF30031/2"1/2"Steel1/2"NPT1 5/8"2 1/4"-€41.44
C3/4 LF30033/4"3/4"Steel3/4"NPT1 7/8"2 1/4"-€50.32
WATTS -

LF301 Series Dielectric Unions

StyleModelInlet SizeOutlet SizeInsulation MaterialMax. Working PressureAdapter MaterialGasket MaterialInlet TypeLeadPrice
ALF301 1 1/21 1/2"1 1/2"Plastic-SteelEPDMFemale ThreadedNot Present€35.44
ALF301 1 1/41 1/4"1 1/4"Plastic-SteelEPDMFemale ThreadedNot Present€23.28
ALF301 11"1"Plastic-SteelEPDMFemale ThreadedNot Present€15.15
BLF301 1/21/2"1/2"Plastic250 psiSteelEPDMFemale ThreadedNot Present€16.35
ALF301 22"2"Plastic-SteelEPDMFemale ThreadedNot Present€49.22
ALF301 3/43/4"3/4"Plastic-SteelEPDMFemale ThreadedNot Present€27.42
WATTS -

Gasket Kits

StyleModelKit ContentsKit TypePrice
AKIT GB-G2 GB Gaskets Per KitGasket Kit€13.29
BKIT GB-H2 GB Gaskets Per KitGasket Kit€13.29
CKIT GB-K2 GB Gaskets Per KitGasket Kit€21.40
DKIT GB-L2 GB Gaskets Per KitGasket Kit€26.18
EKIT GB-M2 GB Gaskets Per KitGasket Kit€40.91
FKIT GB-N2 GB Gaskets Per KitGasket Kit€39.07
GKIT GB-R2 GB Gaskets Per KitGasket Kit€75.60
HKIT GB-Q2 GB Gaskets Per KitGasket Kit€48.29
IKIT GB-P2 GB Gaskets Per KitGasket Kit€45.74
WATTS -

LF3008 Series Dielectric Unions

StyleModelPipe SizeFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeHex SizeOverall LengthConnection TypeBody MaterialInsulation MaterialPrice
ALF3008 3/4-------Polysulfone€56.85
B1 LF30081"1"1"1 7/8"2 1/2"FIP x SolderLead Free Brass-€70.70
C1/2 LF30081/2"1/2"1/2"1 1/2"1 7/8"FIP x SolderLead Free Brass-€63.75
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 SizeAdapter MaterialFitting Side A MaterialFitting Side A Nominal Pipe SizeFitting Side B MaterialFitting Side B Nominal Pipe SizeInlet MaterialInlet SizePrice
ALF3004 1 1/2-Malleable Iron----Malleable Iron1 1/2"€121.69
BLF3004 1 1/4-Steel----Steel1 1/4"€80.07
ALF3004 1/2-Steel----Steel1/2"€40.02
ALF3004 1-Steel----Steel1"€60.05
BLF3004 3/4-Steel----Steel3/4"€45.64
C11/2 LF30041 1/2"-Malleable Iron1 1/2"Malleable Iron1 1/2"--€93.82
D1 LF 3004-11"-Steel1"Steel1"--€118.54
D1/2 LF 3004-1/21/2"-Steel1/2"Steel1/2"--€49.01
E2 LF30042"-Malleable Iron2"Malleable Iron2"--€186.13
D3/4 LF 3004 3/43/4"-Steel3/4"Steel3/4"--€55.91
WATTS -

LF3110 Series Dielectric Unions

StyleModelPipe SizeFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeConnection TypeBody MaterialMax. PressureColorConnection SurfacePrice
ALF3110-LF 3-----175 psi--€725.31
RFQ
BLF3110 2 1/22 1/2"2 1/2"2 1/2"SolderBrass175 psiBrassSolder€788.52
C3 LF31103"3"3"SolderBrass175 psiBrassSolder€658.34
WATTS -

LF3001A Series Dielectric Unions

StyleModelPipe SizeFitting Side A Nominal Pipe SizeFitting Side A TypeFitting Side B Nominal Pipe SizeFitting Side B TypeInlet SizeOutlet SizeOverall LengthPrice
ALF3001A 1/2-----1/2"1/2"-€38.78
BLF3001A 3/4-----3/4"3/4"-€23.56
BLF3001A 1-----1"1"-€41.76
BLF3001A 2-----2"2"-€146.62
BLF3001A 1 1/2-----1 1/2"1 1/2"-€118.60
BLF3001A 1 1/4-----1 1/4"1 1/4"-€69.66
C11/2 LF 3001A-1 1/2 1 1/2"1 1/2"NPT1 1/2"Solder--3"€80.95
C11/4 LF 3001A-1 1/4 1 1/4"1 1/4"NPT1 1/4"Solder--3"€60.28
C1 LF 3001A-1 1"1"NPT1"Solder--2 1/2"€36.08
C1/2 LF 3001A-1/2 1/2"1/2"Female Threaded1/2"Socket--1 7/8"€20.48
C2 LF 3001A-2 2"2"NPT2"Solder--3"€106.53
C3/4 LF 3001A-3/4 3/4"3/4"NPT3/4"Solder--2 1/8"€24.23
WATTS -

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

StyleModelKit ContentsKit TypePrice
AINS-KIT 7/8100 Insulators Per KitInsulator Kit€10.32
BINS-KIT 3/4100 Insulators Per KitInsulator Kit€10.32
BINS-KIT 1/2100 Insulators Per KitInsulator Kit€8.12
CINS-KIT 5/8100 Insulators Per KitInsulator Kit€9.23
WATTS -

3001A Series Dielectric Unions

StyleModelAdapter MaterialInlet SizeOutlet SizeMax. Working PressureInsulation MaterialGasket MaterialInlet MaterialInlet TypePrice
A3001A 1/2Malleable Iron1/2"-250 psiPolysulfoneBuna NIronFemale Threaded€19.44
RFQ
B3001A 1 1/2Steel1 1/2"1 1/2"--Buna NIronFemale Threaded€97.44
B3001A 1 1/4Steel1 1/4"1 1/4"--Buna NIronFemale Threaded€57.12
B3001A 2Steel2"2"--Buna NIronFemale Threaded€120.44
WATTS -

LF3007 Series Dielectric Unions

StyleModelInlet SizeOutlet SizeInsulation MaterialMax. Working PressureAdapter MaterialGasket MaterialInlet MaterialInlet TypePrice
ALF3007 1/21/2"3/8"Polysulfone250 psiSteelBuna NIronMale Threaded€50.43
BLF3007 3/43/4"1/2"Polysulfone-SteelBuna NIronMale Threaded€56.45
StyleModelInlet SizeMax. Working PressureGasket MaterialGasket Maximum PressureGasket Maximum TemperatureInlet MaterialInlet Thread TypeInlet TypePrice
A3004 1 1/41 1/4"250 psiBuna N250 psi180°FIronNPTFemale Threaded€65.64
RFQ
A3004 1/21/2"250 psiBuna N250 psi180°FIronNPTFemale Threaded€32.83
RFQ
WATTS -

RK-3000 Series Dielectric Union Repair Kit

StyleModelKit TypeKit ContentsAda CompliantPrice
AKIT GB-A---€11.80
BKIT GA-H---€6.63
CKIT GB-E---€26.18
DKIT GA-J---€6.63
EKIT GB-D---€21.40
FKIT GA-G---€5.90
GKIT GA-C---€6.63
HKIT GA-D---€8.12
IKIT GB-F---€40.91
JKIT GB-C---€15.86
KKIT GB-BGasket Kit2 GB Gaskets Per Kit-€13.29
LKIT GA-RGasket Kit2 GA Gaskets Per Kit-€36.14
MKIT GA-QGasket Kit2 GA Gaskets Per Kit-€41.30
NKIT GA-EGasket Kit--€8.47
OKIT GA-LGasket Kit2 GA Gaskets Per Kit-€12.53
PKIT GA-AGasket Kit2 GA Gaskets Per Kit-€5.50
QKIT GA-BGasket Kit2 GA Gaskets Per Kit-€4.53
RKIT GA-FGasket Kit2 GA Gaskets Per Kit-€10.69
SKIT GA-PGasket Kit2 GA Gaskets Per Kit-€36.14
TKIT GA-MGasket Kit2 GA Gaskets Per Kit-€15.86
UINK-B-KITInsulator Kit2 Insulators Per Kit-€5.90
VINK-J-KITInsulator Kit8 Insulators Per KitN€42.77
WINK-H-KITInsulator Kit2 Insulators Per KitN€8.83
XINK-E-KITInsulator Kit2 Insulators Per KitN€7.74
YINK-A-KITInsulator Kit2 Insulators Per Kit-€5.90
WATTS -

LF3100 Series Dielectric Unions

StyleModelInlet SizeOutlet SizeMax. Working PressureInsulation MaterialAdapter MaterialGasket MaterialGasket Maximum PressureGasket Maximum TemperaturePrice
ALF3100M3 2 1/22 1/2"2 1/2"175 psiPolysulfoneCast IronBuna N250 psi180°F€439.52
RFQ
BLF3100M3 33"3"175 psiPolysulfoneCast IronBuna N250 psi180°F€602.83
RFQ
BLF3100M3 44"4"175 psiPolysulfoneCast IronBuna N250 psi180°F€1,595.52
RFQ
StyleModelInlet SizeOutlet SizeInsulation MaterialAdapter MaterialGasket MaterialInlet MaterialInlet TypeLeadPrice
ALF3005A 1/21/2"1/2"PolysulfoneSteelBuna NSteelMale ThreadedNot Present€22.91
ALF3005A 3/43/4"3/4"PolysulfoneSteelBuna NSteelMale ThreadedNot Present€21.82
WATTS -

LF3006 Series Dielectric Unions

StyleModelPipe SizeAdapter MaterialInlet MaterialInlet SizeNut MaterialOutlet MaterialOutlet SizeFitting Side A MaterialPrice
ALF3006 3/4-SteelSteel3/4"SteelSteel3/4"-€45.64
ALF3006 1-SteelSteel1"SteelSteel1"-€60.05
ALF3006 2-Malleable IronMalleable Iron2"Malleable IronMalleable Iron2"-€180.14
BLF3006 1/2-SteelMalleable Iron1/2"SteelMalleable Iron--€34.43
C1 1/2 LF30061 1/2"------Malleable Iron€92.50
DLF3006 1 1/41 1/4"------Steel€81.62
WATTS -

Fiberglass Protective Insulated Backflow Enclosures

StyleModelAda CompliantKit TypePrice
A3002 3/4--€31.20
RFQ
BISPTMSTSEAT-16-3GH-RKNReplacement Part€40.19
WATTS -

Union Elbows

StyleModelKit TypeAda CompliantPrice
ATWHV-RK 3/4-1--€90.05
B406-RW-STEM KIT 3--€1,293.49
RFQ
CISPTMSTCVR-1MG3MGH-RKCover KitN€150.44
D6 LL-HKLever Handle Kit-€40.55
ERK CP-16Repair Kit-€148.22
RFQ
F27 BSK-SS-RKRepair Kit-€134.22
StyleModelPipe SizeFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeOverall LengthConnection TypeApplicationColorFitting Side A GenderPrice
A1/2 LF 3005-1/2A1/2"1/2"1/2"2 5/8"MIP x SolderNon-Potable Water, SteamBrassMale€23.76
A3/4 LF 3005-3/4A3/4"3/4"3/4"3"MIP x SolderNon-Potable Water, SteamBrassMale€28.27
WATTS -

LF3100 Series, Dielectric Flange, FIP x Solder

StyleModelPipe SizeFitting Side A Nominal Pipe SizeFitting Side B Nominal Pipe SizeMax. PressurePipe Fitting MaterialOverall LengthConnection TypeBody MaterialPrice
A2 1/2 LF31002 1/2"2 1/2"2 1/2"175 psiCopper, Iron4 1/4"FIP x SolderCopper, Iron€461.12
B2 LF 3100 2 2"2"2"250 psiBrass, Malleable Iron-FIP x Solder-€471.54
CLF3100 33"3"3"175 psiCopper, Iron4 1/2"FIP x SolderCopper, Iron€462.14
12

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.