The charging and discharging pipes of pots-stills, all spirit safes and all man doors cocks, or other openings in stills, spirit vats spirit receivers, spirit charges and other receptacles for spirit, and in spirit pipes with branches, the point where each branch joins the pipes and the doors of all buildings and rooms used for the storage of spirit, shall be so fitted as to enable them to be closed with two locks the key of which are not interchangeable, and of which one lock shall be a revenue lock, in charge of the inspector, and the other a distillery lock in charge of the licensee.
