The Danco Faucet Locknut helps repair loose faucets. The locknut is used to secure a faucet in place. Simply attach the locknut to the faucet shanks from underneath the counter. It is designed to fit all standard 1/2 inch IPS connections.Used to secure a faucet in place,Attaches to the faucet shanks from underneath the counter,Universal design fits standard 1/2 in. IPS faucets,Easy to install