If your kitchen or bathroom faucet leaks from the spout, you might need to replace your faucet's seats and springs. Through normal use of your kitchen or bathroom faucet, the seats and springs can become worn. BrassCraft Manufacturing carries a full line of bibb seats, washers, o-rings, cap thread gaskets, bonnet packings, and screws - all the parts necessary to repair your faucet stems and cartridges.