We boat in the Gulf of Mexico and the bays surrounding Pensacola, FL. Our Hunter 336 is set up so that the toilet only flushes to the holding tank. From there, you can either pump it out via the deck fitting, or pump it overboard via a macerator pump. There is no wye valve in the system, the only valve is a thru-hull ball valve in the discharge line of the macerator pump. My question is - does this valve need to be locked shut in some way to satisfy the Coast Guard? The valve is located in a small locker on my swim platform, so when underway the only way I could even access this valve is to climb out on my swim platform. Just want to make sure I'm legal if anyone ever checks.