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Copper press-fit crossover coupling with EPDM O-rings

Viega

Viega 77742 Crossover Coupling Copper Press-Fit 1/2

SKU CH-H0S2-1YGFJ

Copper press-fit crossover coupling joins two 1/2 in lines, rated 200 psi at 250 °F with EPDM seals

  • Press-fit installation saves time on copper pipework
  • Crossover shape routes lines cleanly without extra elbows
  • Rated for 200 psi and 250 °F in potable water systems
  • EPDM O-ring provides reliable, leak-free sealing
  • Copper construction resists corrosion for long service life

Viega 77742 Crossover Coupling

The Viega 77742 is a copper crossover coupling designed for potable water systems. It joins two 1/2 inch copper tubes using press-fit connections on both ends, eliminating the need for soldering. The EPDM O-ring provides a watertight seal suitable for domestic plumbing installations. This fitting is supplied new and ready for professional or competent DIY use.

Thermals Noise and Power Draw

As a passive copper fitting, the Viega 77742 generates no noise and draws no power during operation. It is rated for a maximum operating pressure of 200 psi and a maximum operating temperature of 250 degrees F, maintaining structural integrity under normal hot and cold water service conditions. The copper body and EPDM seal resist corrosion and scaling, contributing to long-term reliability without active cooling or energy input.

Replaces Soldered Crossover Fittings

This press-fit crossover replaces traditional soldered copper crossover fittings where open flame use is impractical or prohibited. The jump is worth it when installation speed, fire safety, or lack of soldering equipment are primary concerns. It is not suited for systems requiring threaded connections, flanged joints, or tube sizes other than 1/2 inch, nor for applications exceeding the stated pressure and temperature limits.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $21.99
Pricier than about 57% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameVIEGA

Questions about this item

How do I install the Viega 77742 crossover coupling and what step is often missed?

Cut the copper tube square, deburr inside and out, mark the insertion depth, then press with a compatible press tool; the step often missed is verifying the depth mark is still visible after pressing to confirm full engagement.

What maintenance or replacement will the Viega 77742 crossover coupling need later?

The EPDM O-ring seals are designed for the fitting's service life; no routine maintenance is required, but if a leak appears the entire coupling must be cut out and replaced because press-fit joints cannot be disassembled.

What is the first limit reached on the Viega 77742 crossover coupling under sustained use?

The maximum operating temperature of 250 degrees F is typically reached before the 200 psi pressure limit in continuous hot-water circulation, so system design must keep water temperature below that threshold.

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