This locking the overboard valve rule
is just an example of bureaucracy run stupid. My heads pump directly into the holding tank so I have no Y valve. To dump the holding tank overboard I have to open an access panel, crawl into the hole to open a valve in front of the macerator pump, open the through hull
, crawl out, throw the breaker on the macerator and wait 30 or more seconds for the pump to prime and begin dumping. The least troublesome thing I have to do is clip off the wire tie holding the handle of the through hull in position. I bought 600 wire ties for $15 so the cost is not going to inhibit me. My guess is that this rule
never stopped anyone from dumping their sewage overboard that wanted to. What is more likely is that it was created to give law enforcement an excuse to wander through your boat and look in places they weren't allowed to look before the rule was created.