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Old 05-16-2018, 05:41 AM   #61
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City: Seneca Lake NY
Country: US
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
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Here is the one I referred to and can say they work excellent...better than threaded adapters IMO

The flange sucks down on the deck ftg and it is diddicult to break lose.

2008 MS 34 HT Trawler
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Old 05-16-2018, 07:31 AM   #62
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City: Thibodaux, Louisiana
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Vessel Name: Gumbo
Vessel Model: 2003 Monk 36
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As mentioned in post #45 I found it quite easy to replace the original "odd" threaded waste deck fitting with a standard size from a marine store. the screw in nylon Banjo adapters are used in farm chemical systems and can be found at tractor supply or other hardware places, inexpensive.

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Old 05-16-2018, 08:22 AM   #63
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Originally Posted by gaston View Post
Hears a thought hook up the pump out line to the over the side dump macerator line then turn the dump macerator on while vacuuming. And leave the cap off the pump out.
The macerator sucks from the very bottom of the tank so it should empty the tank completely.
Sorry Gaston, but that wouldn't work. The pumpout line also goes to the bottom of the tank, so unless the pumpout line and the overboard discharge line are connected to two separate tank fittings instead of the usual y-valve or tee in the pumpout line, the macerator couldn't get any more out of the tank than the pumpout, and would actually create an obstruction in the pumpout line that would prevent the pumpout from pulliing anything out. And leaving the pumpout cap open wouldn't help either because that line also goes to the bottom of the tank.

However, you may have accidentally stumbled onto something: If there's only a tee in the pumpout line, or the y-valve is open to the macerator during pumpout, depending on how high the tee or y-valve is in the discharge line, AND IF the overboard discharge thru-hull is above waterline, it MIGHT explain why the pumpout can only empty the tank to that point before starting to suck air that would prevent it from pulling any more out.

"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein

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Specializing in marine sanitation since '87.
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