Check Valves Search× Spring-Loaded Poppet Check Valves $65.00 - $168.00 Spring-Loaded Single Ball Check Valves $60.00 - $115.00 High Viscosity Ball No Spring Check Valves $50.00 - $98.00 3/8" Double Ball Stainless Steel No Spring Check Valve $96.50 3/8" Double Ball Alloy 20 No Spring Check Valve $174.00 3/8" Double Ball PVC No Spring Check Valve $137.00 3/8" Single Ball Stainless Steel No Spring Check Valve $99.00 3/8" Single Ball Alloy 20 No Spring Check Valve $168.00 3/8" Single Ball PVC No Spring Check Valve $99.00 1/2" Double Ball Stainless Steel No Spring Check Valve $234.60 1/2" Double Ball Alloy 20 No Spring Check Valve $328.90 1/2" Double Ball PVC No Spring Check Valve $142.00 1/2" Single Ball Stainless Steel No Spring Check Valve $125.00 1/2" Single Ball Alloy 20 No Spring Check Valve $223.00 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