Delta's exclusive DIAMOND seal technology uses a valve with a tough diamond coating. InnoFlex PEX waterways keep water inside the faucet out of contact with potential metal contaminants. This powerful combination brings you a faucet built to last up to five million uses. Only Delta faucets are equipped with Touch-Clean soft, rubber nubbins that allow you to easily wipe away calcium and lime build-up with the touch of a finger. The included escutcheon completes the ensemble for a more finished look.