Check Valves Spring-Loaded Poppet Check Valves $57.00 - $147.00 Spring-Loaded Single Ball Check Valves $52.50 - $114.50 High Viscosity Ball Check Valves $96.50 - $188.00 1/2" Single Ball Stainless Steel Check Valve $123.00 1/2" Single Ball Alloy 20 Check Valve $204.00 1/2" Double Ball PVC Check Valve $104.00 3/8" Single Ball Stainless Steel Check Valve $96.50 3/8" Single Ball Alloy 20 Check Valve $153.00 3/8" Single Ball PVC Check Valve $117.00 1/2" Lead-Free Brass Swing Check Valve $9.89 3/4" Lead-Free Brass Swing Check Valve $13.01 1" Lead-Free Brass Swing Check Valve $18.99