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. Delta is committed to supporting water conservation around the globe and has been recognized as WaterSense® Manufacturer Partner of the Year in 2011, 2013, and 2014. | Delta® Classic Centerset Bathroom Faucet 1L w/o Drain (Recertified), Chrome, 501-TP-DST