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Old 04-02-2013, 04:38   #31
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Join Date: Dec 2012
Location: New Orleans
Boat: 1976 Cal 2-27
Posts: 1,298
Re: Holding Tank Venting

What McGinnis said.

My current setup is manual head that pumps through a vented loop, Y valve, and a short line to either the holding tank or the overboard discharge. I have a pumpout fitting with a hose and a pipe that picks up through the top of the tank at 1" off the bottom. The vent is 5/8" CLEAR hose to a through-hull about a foot below deck level, no vented loop. At that height, siphoning seawater into the tank is a pretty remote possibility and even if it fills up, that just means I can't flush until I pump out. I have no flame screen. I don't consider it necessary, having never heard of a similar installation exploding. The nice thing about the plastic vent tubing is I can easily see if it is clogged or might be clogged, and just replace it. This is a handy size tubing and I usually have at least 10-12 feet of it on the boat for fluid transfers, etc.

Eventually I will probably change the setup so I can dump the tank at sea but for now I like having all my fittings at the top of the tank. Even a slow drip of a leak is something to be avoided.
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