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This dual check backflow preventer is a retrofit/replacement component for both WaterSaver and Guardian Equipment's line of eyewash/drench hoses. Backflow preventers are required by some state/local plumbing codes and prevent contaminated water from flowing back into the building potable water supply. The inlet and outlet are both 3/8" female NPT and the unit has a polished chrome finish. Max inlet pressure is 75 psi.
Application Note: Guardian and WaterSaver are sister companies. Their eyewash and shower lines are generally interconvertible. For example, the Guardian G5022 is equivalent to the WaterSaver EW1022; they simply differ in color scheme.