Read this article to find out how to stop a singlehandlebathtubfaucet from leaking by replacing the O-ring on the valve stem. Leaking bathroom or kitchen faucets can cost money and try your patience. Learn to repair three types of single-handlefaucets – ball, cartridge and ceramic disc. a video on how to repair an older single lever moen faucet. chateau faucet Shop our selection of FaucetRepair Kits in the Peerless Single-Handle Lavatory, Kitchen, Tub and ceramic cartridges handle caps faucetbathfaucet kit tub 1-Spray Tub and ShowerFaucetSingle-handle knob. Danco 88103 Repair Kit for Delta/Peerless Single-HandleFaucets. by Danco. $4.49 $ 4 49 $7.99 Prime. Bath and showerfaucets come in a variety of attractive designs that carefully conceal the screw that holds on the handle. If the faucet is leaking, though, find that screw you must.