Article 7 Exemption under section 1 subject to conditions
The exemption granted by Article 3 of this order in respect of the keeping and use of a class 2 valve is granted subject to the conditions that—
(a)
not more than ten class 2 valves (excluding those incorporated in exempted articles) are on the premises at any time; and
(b)
when not in use, the valve is kept in a container (except when removed for any necessary testing or inspection) marked with, or having attached or affixed to it a label bearing, the words “Radioactive electronic valve” in letters of adequate size, distinctly and legibly printed and conspicuously visible.