This Elanti collection sink holds a uniform plumbing code (UPC) certification which complies with safety and health standards, the product's performance standard, and the uniform plumbing code. The classic square sink is designed to be wall mounted with 3" metal expanding mounting bolts included; drain and faucet not included. An overflow drain is centered within the inner back wall to prevent the risk of water overflow in the event the faucet is left running; see below for the wall mounted sink installation guide. Occupying minimal space, the classic square sink is wall mounted to naturally fit in any decor; features a smooth white porcelain make and rounded-edge square design to provide a simplistic yet beautiful addition to your kitchen or bathroom space.