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Straight bronze press-fit union fitting with MNPT end

Viega

Viega 79730 Straight Bronze Press-Fit 1/2in MNPT 1/2in Trap

SKU CH-7E04-VXAMV MPN 79730

Bronze straight union joins 1/2 in press-fit to 1/2 in MNPT for potable water at 200 psi and 250 °F

  • TypeDrain Components
  • MaterialHAWA
  • Press-fit connection eliminates open-flame soldering on potable water lines
  • Bronze body with EPDM O-ring rated for 200 psi and 250 °F service
  • Straight union joins 1/2 in press-fit to 1/2 in MNPT in 2 11/16 in length
  • Complies with ASTM B75 and ASTM B88 for copper tube applications
  • Ready for immediate installation on new residential or commercial plumbing systems

Straight Bronze Press-Fit Union

The Viega 79730 is a straight bronze union that joins a 1/2 in copper tube via press-fit to a 1/2 in male NPT thread. It suits potable-water systems and installs with standard press tools, eliminating open-flame soldering on site.

Replaces Soldered Copper Unions

This fitting replaces a traditional soldered copper union where flame-free installation is required or where local codes prohibit open flame. The jump is worth it when a quick, reliable mechanical joint reduces labour time and avoids heat damage to surrounding materials.

Sustained Pressure and Temperature Performance

Rated for a maximum operating pressure of 200 psi and a maximum operating temperature of 250 degrees F, the bronze body and EPDM O-ring maintain a seal under continuous hot-water circulation. Compliance with ASTM B75 and ASTM B88 confirms material suitability for long-term service.

Highlights

  • Press-fit connection eliminates open-flame soldering on potable water lines
  • Bronze body with EPDM O-ring rated for 200 psi and 250 °F service
  • Straight union joins 1/2 in press-fit to 1/2 in MNPT in 2 11/16 in length
  • Complies with ASTM B75 and ASTM B88 for copper tube applications
  • Ready for immediate installation on new residential or commercial plumbing systems

Specifications

TypeDrain Components
MaterialHAWA
BrandViega
Model79730

Questions about this item

What copper tube size and thread type does the 79730 fitting accept for a watertight connection?

The press-fit end is sized for 1/2 in copper tube and the opposite end provides a 1/2 in MNPT thread for direct pipe engagement.

Which tool and jaw profile are required to press the 79730 fitting, and what common step is missed?

Use a Viega-approved press tool with the correct jaw for 1/2 in bronze; the step often missed is fully seating the tube to the internal stop before pressing.

When should the EPDM O-ring in the 79730 fitting be inspected or replaced?

Inspect the EPDM O-ring during any system service or if leakage appears; replace it if it shows hardening, cracking, or permanent deformation from prolonged exposure to 250 Degrees F water.

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