The O-ring is a small rubber part located in the inside of a faucet spout, to prevent leaks. These parts are extremely simple, and extremely useful! If your faucet won’t stop dripping from the spout, the cause is most likely an old, worn out and damaged O-ring. Danco carries a wide selection of O-rings you can use to stop that leak once and for all! A wide variety of different sizes and thicknesses means that no matter what your faucet type, Danco’s got you covered.