I'm totally re-plumbing my aft head and holding tank. The old system had the outlet of the tank plumbed to a Y valve, one side going to the macerator for overboard discharge, and the other to the deck pump-out fitting. The head itself pumps directly into the tank no matter what.
I'm not really sure what good the Y valve does in this case. It's a magnet for uninformed boarding officers, so I'd just as soon replace it with a "T" fitting.
The T would be upside down, one arm into the bottom fitting on the tank, the base of the T (pointing up) would have a 1-1/2" hose directly up to the deck fitting, and the other arm would go to the macerator.
Using the macerator would only pump waste no matter what. Using the pump-out fitting with the overboard discharge through-hull closed would only suck up waste. If I forgot to close the through-hull (I don't usually, but it could happen) and used the pump-out, it would probably be sucking both waste and seawater. Not a huge deal unless they start charging by the gallon for pump-outs.
Thoughts?
I'm not really sure what good the Y valve does in this case. It's a magnet for uninformed boarding officers, so I'd just as soon replace it with a "T" fitting.
The T would be upside down, one arm into the bottom fitting on the tank, the base of the T (pointing up) would have a 1-1/2" hose directly up to the deck fitting, and the other arm would go to the macerator.
Using the macerator would only pump waste no matter what. Using the pump-out fitting with the overboard discharge through-hull closed would only suck up waste. If I forgot to close the through-hull (I don't usually, but it could happen) and used the pump-out, it would probably be sucking both waste and seawater. Not a huge deal unless they start charging by the gallon for pump-outs.
Thoughts?