We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Bronze ProPress vent elbow with press-fit and FNPT ends, 90-degree shape

Viega

Viega 79640 ProPress vent elbow 3/4" x 3/4" x 1/8" trap

SKU CH-96X6-STZR2 MPN 79640

Connects 3/4-inch copper tube to 3/4-inch FNPT with a 90-degree vent elbow rated for 200 psi and 250°F

  • TypeDrain Components
  • MaterialHAWA
  • ProPress press-fit connection eliminates soldering for fast installation
  • Bronze construction with EPDM O-ring resists corrosion in potable water systems
  • 90-degree vent elbow design directs airflow in tight spaces
  • Rated 200 psi at 250 °F for reliable performance
  • Meets ASTM B75 and ASTM B88 standards for quality assurance

ProPress Vent Elbow for Potable Water

The Viega 79640 ProPress vent elbow is a bronze crimp fitting designed for potable water systems. It connects a 3/4-inch copper tube via press-fit on one end to a 3/4-inch FNPT thread on the other. The 90-degree vent elbow shape directs flow in tight plumbing layouts. It is suited for installers needing a reliable, press-ready transition.

Press-Fit System Limits at 200 psi and 250°F

This fitting operates within a maximum pressure of 200 psi and a maximum temperature of 250 degrees Fahrenheit. The EPDM O-ring seals the press connection without solder or flux. The bronze body meets ASTM B75 and ASTM B88 standards for material quality. Installers must ensure system conditions stay inside these rated limits for safe service.

90-Degree Vent Elbow Determines Layout Fit

The specific fitting shape is a 90-degree vent elbow with an overall length of 2 17/32 inches. This fixed geometry decides whether the part matches the required pipe routing and clearance. Buyers needing a straight coupling, a different angle, or a sweat connection will require a different fitting configuration.

Highlights

  • ProPress press-fit connection eliminates soldering for fast installation
  • Bronze construction with EPDM O-ring resists corrosion in potable water systems
  • 90-degree vent elbow design directs airflow in tight spaces
  • Rated 200 psi at 250 °F for reliable performance
  • Meets ASTM B75 and ASTM B88 standards for quality assurance

Specifications

TypeDrain Components
MaterialHAWA
BrandViega
Model79640

Questions about this item

Should I pick the 3/4" press-fit by 3/4" FNPT vent elbow or a different ProPress size?

Choose the 79640 when your copper tube is 3/4" and the mating thread is also 3/4" FNPT; other ProPress models cover different tube or thread combinations.

What does the 90-degree vent elbow actually do once it is pressed into the copper line?

It redirects flow 90 degrees while providing a 1/8" vent tapping, rated for 200 psi and 250 °F in potable-water systems.

The press-fit connection follows ASTM B75 and B88 — what pressure does that cap in practice?

The standards govern the copper tube dimensions; the fitting itself is limited to 200 psi maximum operating pressure.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.