Sentence 4.3.7.2.(4)

Intent 1:

To remove the prohibition in Sentence 4.3.7.2.(3) and permit openings, only if they are for the passage of piping and are sealed to the same standards as the containment itself.

Intent 2:

To clarify the application of Sentences 4.3.7.2.(1) and (2) to seals around openings for the passage of piping.