NIBCO PressACR fittings are for use in copper pipe systems for air-conditioning and refrigeration systems. Press technology creates a safer installation for HVACR systems where Class A refrigerants are present since there is no flame or fire hazard. NIBCO’s patent-pending groove design and crimp pattern supports the higher-pressure requirements of an HVACR system. Couplings, elbows and tees currently available in sizes 1/4", 3/8”, 5/16”, 5/8”, 7/8” and 1 1/8”. NIBCO.