(a)The distiller shall so arrange his stills that spirit shall discharge into closed and locked receivers of such pattern that no spirit can be removed from them unless they are unlocked. Every pipe used for conveying spirit or feints must be so fixed and placed as to be visible throughout its entire length and shall, if the Excise Commissioner so directs, be coated with oil paint of a particular colour, and all joints thereof shall be sealed in such manner as the Excise Commissioner may prescribe. If the condensing worm is made of copper or if the spirit passes through pipers wholly or partly made of copper, such measures, as the Excise Commissioner may direct, shall be taken by the distiller in order to protect the liquor from serious contamination by the copper.