Section 18(4)(h) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(h)A wash-basin of vitreous china or other equally hygienic and durable material, which shall be fitted with an efficient and hygienic discharge or to an enclosed tank with a suction pipe served by a mechanically operated pump; provided that a wash basin shall not be required to be fitted in a sleeping room if washing accommodation is readily accessible therefrom;