Easy maintenance with a single access cover for in-line repairs. Valve assembly is made to prevent the backflow of polluted water from entering into the potable water supply due to back siphon-age and or backpressure. Ideal for protection in continuous pressure piping applications and at cross-connections identified as non-health hazards and for contaminants at the service line entrance. Bronze body construction NPT end connections Quarter turn ball valve shutoffs Top mounted test cocks Two in-line independent positive seating check modules Captured springs Replaceable check discs and seats Maximum working pressure 175 psi Helps prevent the backflow of contaminated water into your potable water supply Bronze body for durability For non-potable service applications such as irrigation, fire line and industrial processing