For severe duty, abrasive slurry application. Ductile iron ASTM A536 BODY; 316 stainless steel gate Field replaceable urethane liner. 10" double acting pneumatic cylinder with single coil solenoid valve, proximity switches, and locking ball valve - all pre-wired to fiberglass terminal enclosure. In the event of loss of service or loss or air, Actuator fail position: fail closed loss of service / fail in place, loss of air.