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Stainless steel straight union press-fit fitting, 3/4 inch connections, brushed metallic finish

Viega

Viega 90420 Straight Union Stainless Steel Press-Fit 3/4" 200 psi

SKU CH-AK39-ZWVWF

Straight union joins two 3/4-inch pipes with stainless-steel press-fit ends rated to 200 psi

  • Press-fit ends speed installation on potable water lines
  • 316 stainless steel resists corrosion in demanding plumbing systems
  • EPDM O-ring seals reliably at 200 psi operating pressure
  • Straight union joins two 3/4 in pipes without extra fittings
  • Compact 5 in length fits tight mechanical spaces

Straight Union for Potable Water

The Viega 90420 is a straight union fitting designed for potable water systems. It connects two 3/4 inch pipes using press-fit connections on both ends. The body is made from 316 grade stainless steel for corrosion resistance. This new component suits installers who need a permanent, leak-free joint.

Sustained Pressure Performance

The fitting is rated for a maximum operating pressure of 200 psi. The stainless steel construction maintains structural integrity under continuous system pressure without deformation. An EPDM O-ring provides the primary seal, selected for compatibility with potable water and long-term resilience against thermal cycling. The press-fit method creates a mechanical bond that does not rely on thread engagement or solder joints.

Build Quality and Daily Implications

The 316 stainless steel resists scaling and pitting in aggressive water conditions. The straight union shape allows inline installation and simplifies alignment during assembly. Press-fit ends require a compatible press tool, eliminating the need for open flames, flux or threading equipment on site. The five inch overall length fits standard spacing between fixed pipe runs. No bolt holes or flanges are present, keeping the profile compact for tight cavities.

Highlights

  • Press-fit ends speed installation on potable water lines
  • 316 stainless steel resists corrosion in demanding plumbing systems
  • EPDM O-ring seals reliably at 200 psi operating pressure
  • Straight union joins two 3/4 in pipes without extra fittings
  • Compact 5 in length fits tight mechanical spaces

Specifications

BrandVIEGA

Questions about this item

Does the 200 psi stainless-steel body generate noticeable heat or noise during continuous water flow?

No — the press-fit union is a passive fitting with no moving parts, so it produces neither heat nor audible noise under normal potable-water service.

What press tool and jaw size must I already own to install the 3/4" press-fit ends?

A compatible press tool fitted with a 3/4" stainless-steel jaw (Profile V) is required to form the permanent connection on each side.

Will the EPDM O-rings on this 316-grade union seal reliably against older copper or black-iron pipe I keep in the system?

The union is designed for press-fit stainless-steel tubing only; it does not press onto copper or threaded iron, so a transition fitting would be needed for those materials.

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