This Rebuild Kit for Delta® Monitor Single Lever Handle Tub/Shower Applications is an easy project for the weekend DIYer. Delta® showers with Monitor® pressure-balance valves are engineered to make sure you don’t experience a sudden and possibly unsafe change in water temperature as a result of running water elsewhere, such as using a dishwasher, flushing a toilet or running a washing machine. You can install with confidence, knowing this product is a Genuine Delta® part.