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The 1 inch 720AU Pressure Vacuum Breaker Assembly with union ball valves protects against back siphonage in high health hazard non-potable residential and commercial irrigation applications. The 720A includes an approved check valve vacuum relief two test cocks and inlet and outlet full port resilient seated shut-off valves. It also features a maximum pressure of 150 psi and a temperature range of 33F to 110F. The corrosion-resistant internal parts and all bronze bonnet and body construction provides added strength and protection against light freezes while the tapped ball valves allow for easy installation in any position.