Kingston Brass NB2600KL Water Onyx  4 inch Centerset Lavatory Faucet with Retail Pop-up Drain, Black Stainless Steel High quality brass construction Durable washerless cartridge 4-Inch centerset 3-hole installation with deck plate Max 1.2 GPM/4.5 LPM Water Flow Rate At 60 PSI (ASME standard) Compliant with California Energy Commission Title 20