Dielectric Unions (178 Products)

WATTS

Max. Pressure Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Pipe Fitting Material Fitting Side A Flange Dia. Fitting Side B Flange Dia. Max. Operating Pressure Insulator Material Price
175 psi
2 1/2"
2 1/2"
Copper, Iron
5 7/8"
5 7/8"
175 psi
Polysulfone
$442.49
175 psi
3"
3"
Copper, Iron
6 3/4"
6 3/4"
175 psi
Polysulfone
$443.47
250 psi
2"
2"
Brass, Malleable Iron
5 1/8"
-
175 psi
Polysulfone
$452.49
APPROVED VENDOR

Fitting Side A Material Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Hex Size Fitting Side A Outside Dia. Fitting Side A Pipe Threading Fitting Side B Outside Dia. Max. Pressure Price
Iron
1/2"
1/2"
1 3/8"
1"
14
3/4"
250 psi
$20.32
Iron
3/4"
3/4"
1 9/16"
1 3/16"
14
1"
250 psi
$22.11
Steel
1"
1"
1 15/16"
1 1/2"
11 1/2"
1 1/4"
250 psi
$40.59
Steel
1 1/2"
1 1/2"
2 3/4"
2 1/8"
11 1/2"
1 3/4"
250 psi
$95.08
WATTS

Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Nut Material Finish Max. Pressure Max. Operating Pressure Insulator Material Fitting Side A Material Temp. Price
1/2"
1/2"
Zinc Plated
250 psi
250 psi
Polysulfone
Brass
33°F to 180°F
$22.80
3/4"
3/4"
Zinc Plated
250 psi
250 psi
Polysulfone
Brass
33°F to 180°F
$27.13
WATTS

Outlet Size Max. Pressure Nut Material Inlet Type Adapter Material Outlet Material Outlet Type Insulation Material Price
1 1/4"
250 psi
Steel
Female Threaded
Steel
Lead Free Brass
Socket
Plastic
$23.52
2"
250 psi
Steel
Female Threaded
Steel
Lead Free Brass
Socket
Plastic
$49.72
1 1/2"
250 psi
Steel
Female Threaded
Steel
Lead Free Brass
Socket
Plastic
$35.80
1"
250 psi
Steel
Female Threaded
Steel
Lead Free Brass
Socket
Plastic
$15.30
1/2"
250 psi
Steel
Female Threaded
Steel
Lead Free Brass
Socket
Plastic
$16.52
3/4"
250 psi
Steel
Female Threaded
Steel
Lead Free Brass
Socket
Plastic
$27.70
WATTS

Nut Material Inlet Material Adapter Material Outlet Material Outlet Size Fitting Side A Material Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Price
-
-
-
-
-
Malleable Iron
1 1/2"
1 1/2"
$88.76
-
-
-
-
-
Steel
1 1/4"
1 1/4"
$78.32
Malleable Iron
Malleable Iron
Malleable Iron
Malleable Iron
2"
-
-
-
$181.96
Steel
Steel
Steel
Steel
3/4"
-
-
-
$46.10
Steel
Steel
Steel
Steel
1"
-
-
-
$60.66
Steel
Malleable Iron
Steel
Malleable Iron
-
-
-
-
$34.78
WATTS

Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Outlet Size Fitting Side A Type Fitting Side B Type Hex Size Max. Pressure Inlet Type Price
1/2"
1/2"
-
Female Threaded
Socket
-
250 psi
-
$19.66
3/4"
3/4"
-
NPT
Solder
-
250 psi
-
$23.25
1"
1"
-
NPT
Solder
1 7/8"
250 psi
-
$34.62
1 1/4"
1 1/4"
-
NPT
Solder
2 1/4"
250 psi
-
$57.85
1 1/2"
1 1/2"
-
NPT
Solder
2 3/4"
250 psi
-
$77.68
2"
2"
-
NPT
Solder
3 1/2"
250 psi
-
$102.23
-
-
1"
-
-
-
250 psi
Female Threaded
$42.18
-
-
2"
-
-
-
250 psi
Female Threaded
$148.10
-
-
1 1/2"
-
-
-
250 psi
Female Threaded
$119.80
-
-
1 1/4"
-
-
-
250 psi
Female Threaded
$70.36
WATTS

Outlet Size Max. Pressure Nut Material Inlet Type Inlet Material Adapter Material Outlet Material Outlet Type Price
1/2"
250 psi
Steel
Male Threaded
Steel
Steel
Lead Free Brass
Socket
$23.14
3/4"
250 psi
Steel
Male Threaded
Steel
Steel
Lead Free Brass
Socket
$22.04
WATTS

Nut Material Outlet Size Max. Pressure Inlet Type Inlet Material Adapter Material Outlet Material Outlet Type Price
Malleable Iron
2 1/2"
250 psi
Female Threaded
Steel
Steel
Lead Free Brass
Socket
$211.06
Steel
1/2"
250 psi
Female Threaded
Steel
Steel
Lead Free Brass
Socket
$28.70
Steel
3/4"
250 psi
Female Threaded
Steel
Steel
Lead Free Brass
Socket
$28.70
Steel
1"
250 psi
Female Threaded
Steel
Steel
Lead Free Brass
Socket
$63.48
Malleable Iron
1 1/2"
250 psi
Female Threaded
Steel
Steel
Lead Free Brass
Socket
$150.40
Steel
1 1/4"
250 psi
Female Threaded
Steel
Steel
Lead Free Brass
Socket
$103.50
WATTS

Kit Type Kit Contents Mfr. Series Price
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$13.42
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$13.42
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$21.62
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$26.44
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$41.32
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$39.46
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$76.36
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$48.78
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
$46.20
WATTS

Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Hex Size Max. Pressure Nut Material Max. Operating Pressure Insulator Material Fitting Side A Material Price
1/2"
1/2"
1 1/2"
250 psi
Brass
250 psi
Polysulfone
Brass
$61.17
1"
1"
1 7/8"
250 psi
Brass
250 psi
Polysulfone
Brass
$67.84
-
-
-
250 psi
Brass
-
-
-
$57.42
WATTS

Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Fitting Side B Material Hex Size Nut Material Finish Fitting Side B Type Inlet Material Adapter Material Price
1/2"
1/2"
Steel
1 5/8"
Zinc Plated
NPT
-
-
$39.77
3/4"
3/4"
Steel
1 7/8"
Zinc Plated
NPT
-
-
$48.29
1"
1"
Steel
2 1/4"
Zinc Plated
Fbp
-
-
$62.31
1 1/2"
1 1/2"
Malleable Iron
3 1/2"
Galvanized Malleable Iron
NPT
-
-
$209.61
-
-
-
-
-
-
Steel
Steel
$283.19
-
-
-
-
-
-
Malleable Iron
Malleable Iron
$344.00
WATTS

Nut Material Finish Max. Pressure Nut Material Inlet Type Inlet Material Max. Operating Pressure Adapter Material Insulator Material Price
Zinc Plated
250 psi
-
-
-
250 psi
-
Polysulfone
$42.88
-
250 psi
Steel
Female Threaded
Iron
-
Steel
-
$39.22
WATTS

Nut Material Inlet Material Adapter Material Fitting Side A Material Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Outlet Material Fitting Side B Material Price
-
-
-
Steel
1/2"
1/2"
-
Steel
$47.03
-
-
-
Steel
3/4"
3/4"
-
Steel
$53.65
-
-
-
Steel
1"
1"
-
Steel
$113.75
-
-
-
Malleable Iron
1 1/2"
1 1/2"
-
Malleable Iron
$90.03
-
-
-
Malleable Iron
2"
2"
-
Malleable Iron
$178.61
Malleable Iron
Steel
Steel
-
-
-
Steel
-
$80.88
Malleable Iron
Malleable Iron
Malleable Iron
-
-
-
Malleable Iron
-
$122.92
Steel
Steel
Steel
-
-
-
Steel
-
$40.42
Steel
Steel
Steel
-
-
-
Steel
-
$60.66
Steel
Steel
Steel
-
-
-
Steel
-
$46.10
ZURN

Application Type Specific Fitting Shape Basic Pipe Fitting Shape Price
Potablewater
-
-
-
$130.44
Potablewater
-
-
-
$90.64
Potablewater
Dielectric Pipe Union
Dielectric Union
Union
$38.14
-
Dielectric Pipe Union
Dielectric Union
Union
$74.06
ZURN

Size Type Basic Pipe Fitting Shape Specific Fitting Shape Price
1 1/2" FNPT
Dielectric Pipe Union
-
-
$130.44
1 1/4" FNPT
Dielectric Pipe Union
Union
-
$90.64
1/2" FNPT
Dielectric Pipe Union
Union
Dielectric Union
$56.92
1" FNPT
Dielectric Pipe Union
Union
-
$115.71
-
-
-
-
$612.90
2" FNPT
Dielectric Pipe Union
Union
Dielectric Union
$250.39
3/4" FNPT
Dielectric Pipe Union
-
-
$42.00
3" FNPT
Dielectric Pipe Union
-
-
$396.30
WATTS

Fitting Side A Nominal Pipe Size Fitting Side B Nominal Pipe Size Fitting Side A Flange Dia. Fitting Side B Flange Dia. Max. Pressure Max. Operating Pressure Insulator Material Fitting Side A Material Price
2 1/2"
2 1/2"
7"
7"
175 psi
175 psi
Polysulfone
Copper Silicone Alloy
$810.70
3"
3"
7 1/2"
7 1/2"
175 psi
175 psi
Polysulfone
Copper Silicone Alloy
$631.74
-
-
-
-
175 psi
175 psi
-
-
$732.64
WATTS

Outlet Size Max. Pressure Nut Material Inlet Type Inlet Material Adapter Material Outlet Material Outlet Type Price
2 1/2"
175 psi
Steel
Female Threaded
Iron
Cast Iron
Lead Free Brass
Socket
$443.96
4"
175 psi
Steel
Female Threaded
Iron
Cast Iron
Lead Free Brass
Socket
$1,611.64
3"
175 psi
Steel
Female Threaded
Iron
Cast Iron
Lead Free Brass
Socket
$608.92
WATTS

Outlet Size Max. Pressure Nut Material Inlet Type Inlet Material Adapter Material Outlet Material Outlet Type Price
3/8"
250 psi
Steel
Male Threaded
Iron
Steel
Lead Free Brass
Socket
$50.94
1/2"
250 psi
Steel
Male Threaded
Iron
Steel
Lead Free Brass
Socket
$57.02
WATTS

Kit Type Kit Contents Mfr. Series Lead Free Buy American Act Compliant Ada Compliant Series Price
Gasket Kit
2 GA Gaskets Per Kit
RK-3000 Series
-
-
-
-
$5.56
Gasket Kit
2 GB Gaskets Per Kit
RK-3000 Series
-
-
-
-
$13.42
-
-
-
-
-
-
-
$6.70
-
-
-
-
-
-
-
$16.02
-
-
-
-
-
-
-
$26.44
-
-
-
-
-
-
-
$41.32
-
-
-
-
-
-
-
$6.70
-
-
-
-
-
-
-
$8.20
-
-
-
-
-
-
-
$21.62
-
-
-
-
-
-
-
$6.70
WATTS

Kit Type Kit Contents Lead Free Series Buy American Act Compliant Price
Insulator Kit
100 Insulators Per Kit
Yes
RK-3100/3110/3200 Series
No
$9.32
Insulator Kit
100 Insulators Per Kit
Yes
RK-3100/3110/3200 Series
No
$10.42
Insulator Kit
100 Insulators Per Kit
Yes
RK-3100/3110/3200 Series
No
$10.42
Insulator Kit
100 Insulators Per Kit
Yes
RK-3100/3110/3200 Series
-
$19.83
JOMAR VALVE

Size End Connection Price
1/2"
FIP
$6.08
3/4"
FIP
$8.02
1"
FIP
$13.67
1 1/4"
FIP
$20.48
1 1/2"
FIP
$30.51
2"
FIP
$49.28
JOMAR VALVE

Size End Connection Price
1/2"
FIP
$11.30
3/4"
FIP
$8.65
1"
FIP
$14.08
1 1/4"
FIP
$21.40
1 1/2"
FIP
$32.21
2"
FIP
$51.99
JOMAR VALVE

Size End Connection Price
1/2"
FIP x Solder
$5.14
3/4"
FIP x Solder
$6.17
1"
FIP x Solder
$9.00
1 1/4"
FIP x Solder
$13.44
1 1/2"
FIP x Solder
$19.92
2"
FIP x Solder
$31.98
JOMAR VALVE

Size End Connection Price
1/2"
FIP
$9.80
3/4"
FIP
$13.72
1"
FIP
$20.91
JOMAR VALVE

Size End Connection Price
1/2"
FIP x Press
$12.00
3/4"
FIP x Press
$15.04
1"
FIP x Press
$21.08
1 1/4"
FIP x Press
$28.78
1 1/2"
FIP x Press
$40.85
2"
FIP x Press
$68.10
JOMAR VALVE

Size End Connection Price
1/2"
MIP x Press
$14.22
3/4"
MIP x Press
$17.47
JOMAR VALVE

Size End Connection Price
1/2"
FIP x Solder
$6.12
3/4"
FIP x Solder
$7.98
1"
FIP x Solder
$11.48
1 1/4"
FIP x Solder
$16.79
1 1/2"
FIP x Solder
$24.66
2"
FIP x Solder
$41.41
JOMAR VALVE

Size End Connection Price
3/4"
MIP x Solder
$11.09
1"
MIP x Solder
$15.55
JOMAR VALVE

Size End Connection Price
1/2" x 3/8"
MIP x Flare
$15.40
1/2" x 1/2"
MIP x Flare
$16.62
1/2" x 5/8"
MIP x Flare
$16.76
3/4" x 3/8"
MIP x Flare
$19.92
3/4" x 1/2"
MIP x Flare
$20.64
3/4" x 5/8"
MIP x Flare
$21.59
MUELLER STREAMLINE

Min. Operating Temp. Price
-24°F
$210.38
-23°F
$180.84
-22°F
$140.08
-20°F
$101.91
-25°F
$295.20
-21°F
$109.19
WATTS

MPN Price
4 LF3110
$795.57
APPROVED VENDOR

MPN Price
167-004NL
$25.32
WATTS

MPN Price
3/4X1/2 LF 3002-3/4X1/2
$29.49
WATTS

MPN Price
ISPTMSTSEAT-16-3GH-RK
$40.60
ZURN

MPN Price
2-DUXL
$311.44

Description

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

Q. What is stray current?

A. 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.

Q. What is the function of tailpieces in a dielectric union?

A. Tailpieces allow connecting ends of two dissimilar pipe systems so that liquid can be safely transported with minimal leakage.

Q. How does the dielectric union break continuity?

A. When dielectric unions are connected between two dissimilar pipes, they ground the electric current and break continuity for complete insulation between the two environments.

Q. How to install a dielectric union between steel and copper pipes?

A.

  • 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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