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Bronze ProPress adapter with EPDM O-ring, straight form factor

Viega

Viega 79400 ProPress adapter 1" x 3/4" trap

SKU CH-TWV3-6WH1F MPN 79400

Bronze ProPress adapter joins 1 in. copper tube to 3/4 in. male NPT with EPDM O-ring for potable water up to 200 psi and 250 Degrees F

  • TypeDrain Components
  • MaterialHAWA
  • ProPress press-fit connection eliminates open-flame soldering on potable lines
  • Bronze body with EPDM seal rated for 200 psi working pressure
  • Straight adapter joins 1 in copper tube to 3/4 in male NPT threads
  • Service temperature up to 250 °F suits hot-water distribution
  • Model 79400 supplied new for immediate installation

ProPress Adapter 1" x 3/4

The Viega 79400 is a bronze crimp adapter fitting designed for potable water systems. It connects a 1 inch copper tube on the FTG side to a 3/4 inch male NPT thread on the other side using ProPress technology. An EPDM O-ring provides the seal for the joint.

Replaces Threaded Bronze Adapters

This fitting removes the need for threading copper pipe or applying solder and flux during installation. The press connection is made with a compatible tool in seconds, which is valuable when the water supply cannot be fully drained or when open flame is prohibited on site.

Rated 200 psi at 250 °F

Under sustained system pressure the bronze body and EPDM seal maintain integrity up to the rated limits. The straight adapter shape introduces minimal flow restriction while the 2 1/16 inch overall length fits standard piping layouts without requiring extra space.

Highlights

  • ProPress press-fit connection eliminates open-flame soldering on potable lines
  • Bronze body with EPDM seal rated for 200 psi working pressure
  • Straight adapter joins 1 in copper tube to 3/4 in male NPT threads
  • Service temperature up to 250 °F suits hot-water distribution
  • Model 79400 supplied new for immediate installation

Specifications

TypeDrain Components
MaterialHAWA
BrandViega
Model79400

Questions about this item

What size press tool jaw is needed for the 1" copper end of this ProPress adapter?

A standard 1" ProPress jaw is required to crimp the 1" copper tube side of this bronze adapter.

What is the correct way to thread the 3/4" MNPT side into a fitting?

Apply thread sealant to the male NPT threads and tighten to the recommended torque before pressing the 1" copper end.

How often should the EPDM O-ring on this adapter be inspected or replaced?

Inspect the EPDM O-ring annually for signs of wear or degradation, especially in systems operating near the 250°F temperature limit.

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