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This repair kit is for a 1/4 to 3/8 inch hot or cold water anti-siphon vacuum breaker, series 288A-Z1, which is used to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of a disk and disc float, a bonnet, and O-ring.
1/4 to 3/8 Anti-Siphon Vacuum Breaker Repair Kit 288A-Z1