The Woodford Patented Pressure Relief Valve (PRV) prevents the Woodford faucet tube from bursting in freezing conditions, even if a hose is unintentionally left connected to the faucet. The PRV 10 in. only fits existing Woodford models 14, 16, 17, 19, 22 or V22s with 10 in. rods. Use common household tools to repair. Woodford is the Choice Of Professionals.