These custom Aluminum Bronze Class 150 High Performance Butterfly Valves for a Seawater Application are produced specifically by our Delta T Valves brand to meet API 609 Category A. The custom o-ring grooves on both faces of the valve allow for sealing via o-ring without the need for gaskets between the valve and pipe. Have a special application? Need exotic alloys or custom valve design? Our butterfly and ball valve brands Delta T Valves and Sesto Valves have you covered!