Nantucket Sinks - Nantucket Sinks FCFS30 Fireclay Sink - A very ergonomically designed basin with the drain offset. By offsetting the drain most of the under sink plumbing will be located to the side of choice. The location of these pipes being offset will allow space under the sink for recycling bins and waste basket maximizing your under sink space. Normally this space is reduced by plumbing being centrally located. A sink is constructed from 100% Fireclay and is glazed in white.