Hayward 1-1/2" through 12" all - Plastic Butterfly Valves are rated at a full 150 PSI. Unlike other plastic butterfly valves, Hayward valves are constructed from a one piece body that incorporates fully supported flanged bolt holes to prevent stressing of the mating pipe flanges. Their heavy duty construction stands up to the most demanding applications. The rock solid integral mounting pad ensures that the valve operator will function reliably ?whichever operator is used, lever handle, gear box or actuator.