Apollo® CVB-LF (61LF Series) Ball Cone® Check Valves offer reliable protection against reverse flow and exceptional resistance to chemicals and corrosion using proven ASTM grade lead free* materials. They are well-suited for a broad range of applications, including saturated steam and chemical service. They may be installed in both horizontal and vertical orientation with upward flow. Proudly made in the USA.Bubble-Tight Shut-Off, Ideally Suited for Gaseous ServiceStraight-Through Flow Minimizes Pressure Loss1/2 psi Cracking Pressure