The KISSLER Vacuum Breaker Repair Kit is designed to service the KISSLER Model 609 and 909 vacuum breakers. The kit includes the necessary parts for rebuilding the vacuum breaker, such as the check stop assembly, check valve, critical level float, air inlet valve, and associated gaskets and O-rings. The vacuum breaker protects against backsiphonage and backpressure of contaminated water entering the potable water system. This repair kit allows you to rebuild the internal components of the vacuum breaker and extend its service life. The kit fits 1/2", 3/4", and 1" vacuum breakers.