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Viega 25700 straight press-fit union, zinc nickel-plated steel, 4 1/2 in overall length

Viega

Viega 25700 Press-Fit Straight Union Steel 1/2 in

SKU CH-ETNS-C2ENH

Press-fit steel straight union joins two 1/2 in pipes, rated 200 psi and 250 °F

  • Press-fit ends speed installation without threading
  • Steel body with zinc nickel coating resists corrosion
  • EPDM O-ring seals up to 200 psi pressure
  • Rated for 250 degrees F in non-potable systems
  • Straight union joins two 1/2 in press connections

Press-Fit Steel Union for Non-Potable Water

The Viega 25700 is a crimp union fitting built for non-potable water systems. It joins two 1/2-inch pipes using press-fit connections on both ends. The steel body carries a zinc nickel-plated finish for corrosion resistance. Installers who need a permanent, leak-free joint without threading or soldering will use this fitting.

Maximum Operating Pressure 200 psi

The fitting is rated for a maximum operating pressure of 200 psi. This single figure determines whether the union suits the system design. If the circuit pressure exceeds this value, the fitting is not the correct part. The EPDM O-ring material supports the pressure seal at the press-fit interfaces.

Maximum Operating Temperature 250 Degrees F

The assembly handles continuous service up to 250 degrees Fahrenheit. This temperature headroom covers typical hydronic heating loops and chilled-water returns. Systems that run hotter than this limit will require a different fitting material or sealing method. The overall length is 4 1/2 inches.

Highlights

  • Press-fit ends speed installation without threading
  • Steel body with zinc nickel coating resists corrosion
  • EPDM O-ring seals up to 200 psi pressure
  • Rated for 250 degrees F in non-potable systems
  • Straight union joins two 1/2 in press connections

Specifications

BrandVIEGA

Questions about this item

What does the 200 psi rating mean once the fitting is installed in a real system?

It indicates the maximum operating pressure the steel press-fit union can handle in service without leaking or failing.

What connection standard does the press-fit interface follow and what does it cap in practice?

The press-fit ends accept 1/2 in pipe and seal with an EPDM O-ring, limiting use to compatible press-tool systems and the 200 psi / 250 °F ratings.

What physical space and pipe size are needed to fit this straight union?

It requires two 1/2 in pipe ends and 4 1/2 in of straight run for the zinc nickel-plated steel body.

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