While the 3155 series typically requires a single gasket

Precise Port Alignment: Pre-cut 5-hole layout ensures accurate placement over indicator lights and switches

Robust Construction: Built to handle the rigorous thermal demands of HVAC air handlers and high-efficiency gas furnaces

Constructed from high-impact

Apply a compatible thread sealant to the male threads and torque to the manufacturer-specified 50-60 ft-lbs using a 7/8" hex socket to prevent bypass leaks

Mueller W01072 2-1/8" Coupling While the 3155 series typicallyThe Mueller W01072 is a high performance 2 1 8" OD copper coupling engineered for professional HVACR and pressurized plumbing applications. This wrot copper fitting features a rolled stop (WC 400), ensuring precise tube alignment and consistent solder flow during installation. Manufactured from UNS C12200 grade copper to meet ASTM B75 and ASME B16. 22 standards, it provides the structural integrity required for critical refrigeration cycles and