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. WaterSense certification promotes water conservation DIAMOND Seal Technology features a valve embedded with diamonds to ensure like-new operation for the life of the faucet Includes optional 6-3/16 in. escutcheon for 3-hole installations Includes matching finish plastic pop-up drain assembly Single Handle Centerset Bathroom Faucet