Mueller W01036 7/8 x 5/8 Coupling

The Mueller W01036 7/8 x 5/8 Coupling is a professional-grade HVAC copper reducing coupling engineered for high-pressure refrigeration and air conditioning systems. As a staple in the Mueller Streamline series, this wrot copper fitting utilizes a CxC (Cup x Cup) solder connection, providing a seamless transition between 7/8" OD and 5/8" OD linesets. Built to withstand the thermal stresses of modern refrigerants like R-410A, this copper reducer coupling meets rigorous ASME B16.22 and NSF 61G standards for material purity and structural integrity. For technicians performing field repairs or new installs, the Mueller W01036 ensures a precise fit with consistent wall thickness, minimizing turbulence and pressure drops across the connection. Its corrosion-resistant construction is ideal for both residential and commercial AC line size reduction, delivering the reliability required for critical liquid or suction line applications where leak-free performance is non-negotiable.

• Precision Machined: Manufactured from high-grade UNS C12200 wrot copper to ensure exact tolerances for solder-joint integrity.
• Multi-Standard Compliance: Meets ASME B16.22 and ASTM B75 specifications, making it suitable for both HVACR and potable water systems.
• Refrigerant Compatibility: Designed to handle high-pressure cycles of modern refrigerants, including R-410A and A2L alternatives.
• Reduced Pressure Drop: Smooth internal transitions prevent flow restriction when down-sizing from 7/8" to 5/8" tubing.

Is the Mueller W01036 compatible with R-410A systems?
Yes, this wrot copper coupling is designed specifically for the high-pressure demands of HVACR systems utilizing R-410A and other common refrigerants.

Does this fitting require specific brazing alloys?
While compatible with standard soft solders, for HVACR applications it is recommended to use silver-bearing brazing alloys (stay-brite) or phosphorus-copper brazing rods for maximum joint strength.

What is the difference between the 7/8" nominal and OD size?
In HVACR, sizing is typically referred to by Outside Diameter (OD). This fitting connects a 7/8" OD tube to a 5/8" OD tube (equivalent to 3/4" x 1/2" nominal plumbing sizes).

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.