The Danco 3-piece repair kit for Moen faucets helps restore a leaky faucet. Replacing the O-ring will help eliminate leaks around the base of the spout. This kit is ideal for single-handle faucets and will create a better seal and help prevent water leaks. Faucets usually have one or more O-ring that prevent water from leaking out around the spout. Replacing worn-out O-ring is an inexpensive alternative to replacing the entire faucet fixture.