Irritrol 300-.75 3/4" Electric Valve Adapter Converts 3/4-inch and 1-inch Champion brass anti-siphon valves (models 300-.75 and 300-1) and 1-inch Irritrol manual valves to electric operation Internal and external bleed (flush mode) Rugged, double-beaded nylon-reinforced Buna-N diaphragm Tough, glass-reinforced nylon, stainless steel and brass construction