Internal Type Excess Flow Check Valves are compact, with one-piece body construction. They are designed primarily for use with LPG and anhydrous ammonia as a main valve on pumping systems, and in-line installations. Installation is quick and easy, and it fits in both full and half couplings. The valve may be opened manually by hand or pneumatic actuator. It is equipped with 212° F, UL listed fuse link for thermal protection.