Red Seal Plumbing Practice Exam

A double compartment kitchen sink is replaced with a triple compartment kitchen sink. What drainage changes are necessary?

1. No changes necessary

2. Install two separate traps

3. The fixture trap and fixture drain is to be one pipe size larger than largest sink outlet

4. Replace the sink only, no drainage modification

The correct answer is: The fixture trap and fixture drain is to be one pipe size larger than largest sink outlet

When changing from a double compartment sink to a triple compartment sink, the drainage changes that are necessary involve increasing the pipe size for the fixture trap and the fixture drain to accommodate the larger sink outlet. Option A is incorrect because changes are necessary in order for the new sink to function properly. Option B is incorrect because two separate traps would not be necessary with a larger sink. Option D is incorrect because a larger sink would require adjustments to the drainage system.