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. Purchase optional deck plate RP100091 (not included) for 3-hole installations 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 Brilliance 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 MATCHING DRAIN INCLUDED: A coordinating metal drain assembly in matching finish is conveniently included in the box You can install with confidence, knowing Delta bathroom faucets are backed by Delta Faucet's Lifetime Limited Warranty