Orbit 3/4 in. or 1 in. Green Jar Top Valve Heavy-duty construction with stainless steel components provides years of reliable service Compatible with standard 24 volt sprinkler systems Manual on/off bleed screw for testing and flushing sprinkler systems Threaded easy-access jar-top lid design for easy serviceability This simple and reliable design includes manual operation and a standard 24 volt solenoid for connection to an irrigation timer.