HSCV400 Dixon Valve HSC Spring Check Valve - 4" Clamp Connection - FKM Gasket - 316L Stainless SteelFeatures: Machined from solid bar Standard O ring (FKM) and gasket seal design Can be serviced in field (no special tools required) Finish: sanitary polish 32 Ra Temperature Range: 15 F to 200 F Part Number Size Cracking Pressure Max. Operating Pressure HSCV050 1 2" 10. 0 PSI 145 PSI HSCV075 3 4" 4. 0 PSI 145 PSI HSCV100 1" 2. 5 PSI 145 PSI HSCV150 1 1 2" 1. 0 PSI 145 PSI HSCV200 2" 1. 5 PSI 145 PSI HSCV250* 2 1 2" 0. 8 PSI 145 PSI HSCV300* 3" 0. 5