ANTI SIPHON VALVE: Backflow protector valve perfect for helping to prevent dangerous backflow and back siphonage into potable water supply APPLICATION: Backflow preventer is ideal for use with garden hoses, outdoor faucets, and spigots EASY TO USE: Backflow device can be easily attached directly to a hose bib DURABLE: Pressure vacuum breaker is composed of sturdy brass with a silicone rubber seat to prevent leakage DIMENSIONS: Vacuum breaker check valve measures 3 W x 2 D x 2 H in inches; maximum water pressure of 125 PSI, and maximum operating temperature of 212 degrees F (100 degrees C)