Question 1675 Deck General

The correct answer is D) All of the above. The regulations in 46 CFR Subchapter T, which covers small passenger vessels, have the following requirements for rigid plastic or other nonmetallic piping: 1) It can only be used in non-vital systems, not in critical systems like fuel lines. 2) It must have approved metallic fittings and cutoff valves where it penetrates a watertight deck or bulkhead to maintain the integrity of the watertight boundary. 3) It cannot be used in gasoline or diesel fuel systems, which require metallic piping for safety reasons. Therefore, all of the listed requirements in the answer choices apply to the use of rigid plastic or nonmetallic piping under Subchapter T regulations.