Your non-oceangoing vessel is required to have a fixed piping system to discharge oily mixtures ashore. What is required at each outlet of this system?

Correct Answer: Option D — A stop valve

Title 33 CFR 155.410 requires non-oceangoing vessels equipped with fixed piping for oily mixture discharge to have a stop valve at each outlet. This ensures positive closure and prevents accidental discharge of oily waste into navigable waters.