Kohler Co. Supplies 1600 mm Cast Iron Drop-In Bath, K-943-0. Kohler Co. Is an ISO-9001 certified manufacturer of Bathroom Suites, ensembles and other toiletries. This bath features 1600 x 700 x 423 mm size and white colour. It comes without grip rails. Its optional component is K-1491-7 Removable black pillow and required component is K-17295-CP Drain.