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Bronze ProPress dielectric union with press and threaded ends

Viega

Viega 79175 ProPress di-electric union trap 1-1/2" x 1-1/2

SKU CH-M1K7-SETRF MPN 79175

A di-electric union trap joins 1-1/2 inch press-fit copper to 1-1/2 inch FNPT while preventing galvanic corrosion, rated to 200 psi and 250 degrees Fahrenheit

  • Product typeDrain Components
  • Main materialHAWA
  • Bronze construction resists corrosion in potable water systems
  • Press-fit connection enables fast, flame-free installation on copper tubing
  • EPDM O-ring provides reliable sealing up to 200 psi working pressure
  • Di-electric union design prevents galvanic corrosion between dissimilar metals
  • Rated for continuous operation at 250 °F maximum temperature

ProPress Di-Electric Union

The Viega 79175 is a bronze crimp union fitting designed for potable water systems. It connects 1-1/2 inch copper tube via press-fit on one end to 1-1/2 inch FNPT threads on the other. The di-electric union prevents galvanic corrosion between dissimilar metals. It includes an EPDM O-ring for sealing.

Installers joining copper to threaded pipe

Suited for plumbers transitioning from copper tubing to threaded iron or steel components in domestic water lines. Not for buyers who need a straight press-to-press coupling without threaded ends. Not for installers working with tube sizes other than 1-1/2 inch. Not for applications exceeding the rated pressure or temperature limits.

200 psi maximum operating pressure

This fitting withstands up to 200 psi at a maximum operating temperature of 250 degrees Fahrenheit. These ratings determine whether the union is appropriate for the specific system design. Verify that the service conditions stay within both limits before installation.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $97.99
Pricier than about 76% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameViega
Model name79175
Product typeDrain Components
Size & build
Main materialHAWA

Questions about this item

What press tool and jaw set are required to install the 1-1/2" ProPress connection on this union?

Use a Viega ProPress tool with the 1-1/2" jaw to crimp the copper press end; the other end threads onto 1-1/2" FNPT pipe.

Will the bronze body and EPDM O-ring handle the same 200 psi and 250 °F limits as my existing copper press system?

Yes, the union is rated for 200 psi maximum operating pressure and 250 °F maximum operating temperature, matching typical ProPress system limits.

After pressing and threading, how can I verify the dielectric isolation is working correctly?

With the system pressurised, check for leaks at both connections and use a multimeter to confirm electrical discontinuity across the union.

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