The ACK check valve is a normally closed magnetic check valve that prevents reverse refrigerant flow in liquid lines and compressor discharge lines. Copper Connection Sizes 1/4” through 2-5/8” Hermetic Spun Copper Design Magnetic Checking Action Built-In 30 Mesh Stainless Steel Strainer Can Be Installed In Any Position • UL/CUL File number: SA 5312 Dimensional Data Check Valve Series Copper ODF Connection Size (in 1/16”) Ordering Information and Dimensional Data (in) PCN Connection Size Opening Opening Nominal Tons Nominal Tons MWP Pressure Pressure R-22 Suction R-22 Liquid (psig) (oz/sq in) (psig) 40°F @ 1 psi 40°F @ 1 psi Cross Reference (Identical Lay-In) Emerson 2004FC-118 R14 (10/14) Emerson™ valves, controls and system protectors – General Purpose Catalog