Allora USA 20.25" X 15" White Vitreous China Rectangle Porcelain Undermount Sink with OverflowThe VCS 1318 white rectangle porcelain undermount sink is made from true vitreous china which is triple glazed and triple fired to ensure your sink is durable and strong. Undermounting a bathroom sink creates a sleek look and allows for more space on your countertop. The overall dimensions for the VCS 1318 are 15 x 20 1 4 x 7 5 8 and requires a 24 minimum cabinet size. Vitreous China VS. Porcelain: What's the difference? There is a decent amount of