Watts Series 800M4 FR Anti-Siphon Freeze-Resistant Pressure Vacuum Breaker 1" (0388015)

«  ↑  » Watts Series 800M4 FR Anti-Siphon Freeze-Resistant Pressure Vacuum Breaker 1" (0388015) Watts Series 800M4 FR Anti-Siphon Freeze-Resistant Pressure Vacuum Breaker 1" (0388015) Watts Series 800M4 FR Anti-Siphon Pressure Freeze-Resistant Vacuum Breaker 1" (Tee Handle) This valve is designed to prevent back-siphonage of contaminated water into a potable water supply. The valve is ideally suitable for irrigation systems, industrial process water systems and other continuous pressure piping system applications where the water enters the equipment at or below its flood rim. The disc float and check valve are suitable for temperatures up to 140°F. The resilient sealing float o-ring and seal check disc are silicone rubber which is resistant to heat, shock and chemical attack. • FR = One-of-a-kind built-in relief valve relieves pressure caused by ice formation. As the ice forms and expands, causing a buildup of pressure, the 800M4FR relieves the pressure through an exclusive relief valve built into the plastic float. Features: Replaceable plastic seat. Easy maintenance of internal parts. Acetal bonnet to act as "freeze plug" to prevent body damage. O-ring bonnet seal for less possibility of fouling. Silicone seat disc for ruggedness. Test cocks positioned for easy testing and winterization. Compact space saving design. Standardly equipped with tee handle quarter turn ball valve shutoffs 1/2" - 1" (15-25mm). The 1-1/4" - 2" (32-50mm) feature lever handles, No special tools required for servicing. Bronze body for ruggedness. Maximum Pressure:150psi (10.3 bar), Minimum Pressure: 15psi (55kPa). * The built-in relief valve is not designed to provide freeze protection for the entire irrigation system.