Valve body, stem, ball, seat carrier, union nuts and connections are choice of PVC, CPVC, beige polypro, or PVDF. Seats are PTFE; O-rings are choice of EPDM or FKM. Handle is molded of ABS. Maximum test pressure under laboratory conditions at 75°F is 235 PSI on 1/2" through 2" sizes, 150 PSI on 3" and 4". Polypro is rated at 70% of these values. Actual maximum pressure varies by application based on temperature, flow rate,and media.