Red Seal Plumbing Practice Exam

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The National Plumbing Code of Canada prohibits the use of which type of trap?

The correct answer is: S

The National Plumbing Code of Canada prohibits the use of type "S" traps. Option A is incorrect because "P" traps are commonly used in drainage systems. Option C is incorrect because "Q" traps are not prohibited by the National Plumbing Code of Canada. Option D is incorrect because "U" traps are commonly used and are not prohibited by the code. Therefore, the correct answer is B, as "S" traps are specifically prohibited by the code.