GUARANTEED QUALITY: Quality is our top priority, so all our bathroom sink faucets are tested and certified, meeting or exceeding industry codes and standards SINGLE HOLE BATHROOM FAUCET: Fits 1 or 3-hole 4 in. installations, optional deck plate (included) with gasket seal helps prevent drips and splashes from leaking under the bathroom sink faucet LASTS 2X LONGER: Patented DIAMOND Seal Technology reduces leak points and lasts twice as long as the industry standard—ensuring leak-free operation for the life of the bathroom sink faucet CORROSION-RESISTANT FINISH: Our finishes are intentionally engineered for durability and tested for corrosion resistance to at least 2 times industry standards TESTED AND CERTIFIED: All Delta bathroom faucet finishes are third-party certified and vigorously tested under extreme conditions to ensure years of dependable use without cracking, peeling, chipping, blistering or changing color over time EASY-TO-CLEAN DRAIN: Metal push pop-up drain unscrews from above the deck for quick removal and easy cleaning of hair and other bathroom sink debris You can install with confidence, knowing Delta bathroom faucets are backed by Delta Faucet's Lifetime Limited Warranty