Lawn Genie 54000 150 psi RJ Anti-Siphon Valve with Flow Control Use in 24 VAC systems to help prevent irrigation water contaminants from entering the drinking water supply Installed height should not be less than 6 in. above the highest downstream outlet. Self-aligning bonnet ensures correct installation 5 - 25 GPM flow rate. Precise flow control adjustment reduces misting and fogging at the sprinkler to save water Stainless-steel metering pin. 3/4 in. FNPT inlet and outlet Captive solenoid plunger to help prevent lost parts during maintenance. Pressure-activated double-beaded diaphragm to strengthen the seal between the body and bonnet External bleed to flush out dirt from the supply and lateral lines during new installations or repairs. 4-1/4 in. Footprint Size (Center to center of inlet/outlet)