The Toro 150 psi Anti-Siphon Irrigation Valve has a 1 in. inlet size and built-in backflow prevention to protect drinking water from contamination. Flow control allows you to conserve water by fine-tuning the amount of water pressure to individual zones. This valve has a stainless-steel metering pin and safe, low-voltage 24-Volt AC solenoid with captured plunger. A jar-top opening allows easy access to the diaphragm. The valve can be bled internally or externally for system upgrades and maintenance.