Designed to match our Commercial Series valves. 150psi burst pressure and NSF listed. Full port design with a double stem o-ring that ensures a watertight shut off and eliminates hard to turn operation, leaks and handle breakage. HDPE seats provides additional soft open and close operation. EPDM o-rings to ensure excellent resistance for pool applications. Injection molded SCH 40 PVC construction, ASTRALPOOL unique Antiblock feature allows unlimited tightening of the connection unions without affecting the smooth open and close operation of the valve.