There shall be no openings into any still; except those in connection with the charging and discharging pipes, pipes for the conveyance of various fluids from one part of the still to another condensers, mandoors and air cocks or valves upon the breast or head. The external orifice of an air valve must be so constructed and covered by a [perforated metal plate so as] [Substituted vide Notification No. G.S.R. 28/P.A. 1/14/Ss. 21 and 59/95, dated 15.1.1995.] to make it impracticable by means of it either to introduce wash or to abstract spirit or to convey away, spirit vapour for condensation elsewhere.
