The self-operated Type E5 Main valve is designed with an external pilot type, single seated, diaphragm actuated, and of normally closed design. This valve functions quickly and shuts tight on dead end service. The internal parts of this valve are composed of stainless steel. This valve is simple to maintain and all parts are accessible without removal of the line. Sizes of the E5 Main valve range from 3/4" to 12". E5 is capable of pressures to 300 psig and 600 degrees fahrenheit.