Hose thread anti-syphon valve prevents irrigation water from flowing back into your domestic water supply by siphonage. Required by many municipalities and a good idea for all drip circuits. Made of glass reinforced construction. Integral lock screw meets all code requirements, IAPMO and ASSE 1011 standards. Click for an article on using this item

• 3/4" female hose threads at inlet and 3/4" male hose thread at outlet
• Corrosion and chemical resistant
• Operating pressure range: 0-125 PSI