Section 27(9)(a) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(a)a water closet pedestal of single type with-(i)a pan of white vitreous china or other suitable material;(ii)a seat of polished hardwood or other suitable material with an opening of 10.2 centimetres at the front;(iii)a trap with a metal inspection plate; and(iv)an efficient ventilator connected to the out let;