Merrill MASVBPK Vacuum Breaker Repair Kit For MA Series Frost Proof Wall Faucet

Internal Repair Parts For The Merrill MA Series Wall Hydrant Vacuum Breaker also for Cello and American Valve. The small poppet rises when the water is turned on to seal the breaker. When the water is turned off the poppet falls to allow air into the system so water can't be siphoned back into the house from the hose.