Mueller W01035 7/8 x 3/4 Coupling

The Mueller W01035 is an essential 7/8 x 3/4 reducing coupling for HVACR technicians performing precise line set transitions. Engineered from high-grade wrot copper, this CxC (Cup x Cup) fitting is designed for seamless integration in high-pressure refrigeration and air conditioning systems. With a 700 PSI max pressure rating and an operating temperature range of -40°F to 250°F, it maintains structural integrity under the thermal stresses common in R410A and modern refrigerant cycles. Since it meets ASME B16.22 and MSS SP104 standards, you can trust its dimensional consistency when brazing or soldering. The WC-400R series profile ensures a depth-stop that prevents over-insertion, maintaining optimal flow velocity and preventing oil trapping at the joint. Whether you are adapting a 3-ton condenser to a mismatched line set or performing a field repair on a liquid line, this copper pressure fitting provides the tight tolerances needed for a leak-free, professional finish.

• Precision Size Transition: Specifically designed for 7/8" OD to 3/4" OD tube reductions, ensuring a clean fit without improvised "shove-together" joints.
• Industrial Durability: Manufactured by Mueller Streamline, the industry standard for ACR copper fittings since 1930.
• High Pressure Resilience: Rated for up to 700 PSI, making it fully compatible with high-pressure systems and diverse refrigeration oils.
• Code Compliance: Built to ASME B16.22, NSF 61G, and UMC standards for residential and commercial mechanical inspections.

Can this coupling be used with both hard and soft copper tubing?
Yes, the Mueller W01035 is approved for use with ACR, Type L, and Type K copper tube in both hard-drawn and annealed (soft) tempers.

Is this fitting compatible with modern R410A systems?
Absolutely. The wrot copper construction and 700 PSI rating are specifically engineered to handle the higher operating pressures of R410A and other common refrigerants.

Does this coupling require a specific brazing alloy?
Standard HVACR brazing alloys, such as 15% silver or stay-brite solder, are compatible. Ensure proper nitrogen purging during brazing to prevent internal oxidation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.