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Bronze ProPress union with press-fit and threaded ends, EPDM seal, straight body

Viega

Viega 79755 ProPress Union 2" x 2" Trap

SKU CH-NSZY-ZFPWX MPN 79755

Bronze press-fit union joins 2 in copper tube to 2 in MNPT with EPDM seal

  • TypeDrain Components
  • MaterialHAWA
  • ProPress press-fit joint installs without flame using 200 psi rated bronze
  • EPDM O-ring seal handles 250 Degrees F for hot-water service
  • Straight union connects 2 in copper to 2 in MNPT threads
  • Meets ASTM B75 and ASTM B88 material standards for potable water
  • 4 9/16 in overall length fits tight mechanical spaces

2" ProPress Union for Potable Water

The Viega 79755 is a straight union fitting that joins a 2" copper tube press connection to a 2" male NPT thread. It is designed for potable water systems and meets ASTM B75 and ASTM B88 standards. Installers use it to create a secure, flameless transition between press-fit copper piping and threaded components.

Rated for 200 psi and 250 °F

Bronze construction with an EPDM O-ring handles a maximum operating pressure of 200 psi and temperatures up to 250 degrees Fahrenheit. The press-fit connection eliminates the need for open-flame soldering, reducing fire risk and installation time on site. The union allows straightforward disassembly for maintenance or system changes.

Includes integral EPDM sealing element

The fitting ships with the EPDM O-ring already seated in the press end, so no separate seal components are required. This ensures the correct seal material is used for potable water applications and speeds up the press operation. No additional gaskets, bolts or flange hardware are needed for the straight union configuration.

Highlights

  • ProPress press-fit joint installs without flame using 200 psi rated bronze
  • EPDM O-ring seal handles 250 Degrees F for hot-water service
  • Straight union connects 2 in copper to 2 in MNPT threads
  • Meets ASTM B75 and ASTM B88 material standards for potable water
  • 4 9/16 in overall length fits tight mechanical spaces

Specifications

TypeDrain Components
MaterialHAWA
BrandViega
Model79755

Questions about this item

How do I press the 2 in copper side of the ProPress union 79755 without damaging the EPDM O-ring?

Use a calibrated ProPress jaw for 2 in copper tube, keep the fitting square to the tube, and press once; the tool’s indicator confirms a complete crimp without over-compressing the EPDM seal.

When should I replace the EPDM O-ring on the 2 in ProPress union 79755?

Inspect the EPDM O-ring at each system service; replace it if you see cracking, flattening, or leakage at the press joint, especially after prolonged exposure near the 250 °F temperature limit.

What pressure limit will I hit first when running the 2 in ProPress union 79755 continuously at high temperature?

The 200 psi maximum operating pressure is the limiting factor; at sustained temperatures approaching 250 °F the bronze body and EPDM seal remain rated to 200 psi, so pressure governs before temperature does.

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