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Bronze ProPress union, press-fit by FNPT, 3/4 inch, EPDM seal

Viega

Viega 79705 ProPress union 3/4 in press-fit x 3/4 in FNPT bronze EPDM 200 psi 250 °F

SKU CH-3PR4-PD8FM MPN 79705

A bronze ProPress union joins 3/4 in press-fit copper to 3/4 in FNPT with an EPDM seal rated for 200 psi and 250 °F

  • TypeDrain Components
  • MaterialHAWA
  • Press-fit installation saves time on potable water lines
  • Bronze body with EPDM seal handles 200 psi at 250 °F
  • 3/4 in press x 3/4 in FNPT straight union connects copper to threaded pipe
  • Meets ASTM B75 and ASTM B88 standards for drainage components
  • Model 79705 supplied new for reliable ProPress system integration

ProPress union for potable water systems

The Viega 79705 ProPress union joins 3/4 in copper tube to a 3/4 in female NPT thread using a press-fit connection on one side and a threaded connection on the other. It is intended for potable water installations where a removable joint is required. The bronze body and EPDM O-ring suit standard plumbing applications.

Rated for 200 psi at 250 °F

The fitting meets ASTM B75 and ASTM B88 standards for pressure and temperature performance in normal service. Bronze construction handles the rated pressure without deformation, while the EPDM seal maintains integrity across the temperature range. No external power or active cooling is involved.

Bronze body with press and FNPT ends

The straight union measures 2 7/16 in overall length and uses a press-fit end for copper tube and an FNPT end for threaded pipe. Bronze resists corrosion in water supply lines, and the EPDM O-ring provides the seal at the press connection. The joint can be disconnected at the threaded side for maintenance or reconfiguration.

Highlights

  • Press-fit installation saves time on potable water lines
  • Bronze body with EPDM seal handles 200 psi at 250 °F
  • 3/4 in press x 3/4 in FNPT straight union connects copper to threaded pipe
  • Meets ASTM B75 and ASTM B88 standards for drainage components
  • Model 79705 supplied new for reliable ProPress system integration

Specifications

TypeDrain Components
MaterialHAWA
BrandViega
Model79705

Questions about this item

How do I install the Viega 79705 ProPress union without damaging the EPDM O-ring?

Cut the 3/4 in copper tube square, deburr inside and out, mark the insertion depth, then press with a calibrated ProPress jaw; the O-ring stays seated only if the tube is fully inserted before the press cycle starts.

What maintenance will the bronze union and EPDM seal need over time?

Inspect the EPDM O-ring annually for hardening or cracking; replace it if the seal weeps, and re-press the joint using a new union — bronze bodies do not require internal cleaning under potable-water service.

At what temperature does the 200 psi rating on this 3/4 in union become the limiting factor?

The 200 psi maximum operating pressure holds up to 250 °F; above that temperature the EPDM O-ring degrades and the pressure rating can no longer be guaranteed.

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