Made with nature as both guide and inspiration, Novatto's beige travertine vessels will add character and charm to your bath. Natural stone cannot be compared to everyday synthetic porcelain and ceramics. Honed and hand polished to perfection, this 17-inch vessel will be your bath's centerpiece. Beige travertine is very consistent and little variation should occur from sink to sink. Designed for above-counter installation, these vessels have a 1.75-inch drain opening for standard U.S. plumbing connections. For easy maintenance apply the included Glacier Ice sealer. This will help seal the pores in the stone to prevent water spotting. For best cleaning results, a soft cloth with mild soap and water or a non-abrasive stone cleaner is recommended. Novatto strives to provide superior products with exceptional qualities and unique innovations professionals and homeowners trust. Included with the sink is Novatto's umbrella drain (UPD-CH), constructed of solid brass for strength and durability. Finished in chrome, the drain assembly has two rubber seals, a plastic spacer, and brass fastener. Novatto strives to provide superior products with exceptional qualities and unique innovations that professionals and homeowners trust.