UNIVERSAL - WORKS WITH RESIDENTIAL STANDARD 24 VOLT SPRINKLER SYSTEMS FLOW CONTROL - ADJUSTS AMOUNT OF FLOW TO SPRINKLERS MANUAL ON/OFF BYPASS LEVER - IDEAL FOR TESTING AND FLUSHING SPRINKLER LINES ANTI-SIPHON - PREVENTS CONTAMINANTS FROM ENTERING THE WATER SUPPLY LISTED BY INTERNATIONAL ASSOCIATION OF PLUMBING MECHANICALS OFFICE