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Tim, you would use a top fitting in a gravity operated tank for emptying path, instead of bottom fitting directly to the seacock fitting??
That's how my boat's tank is configured; input, output, and vent fittings are all on the tip of the tank. You just need to fit "dip-tube" from the output fitting on the top of the tank (the input fitting doesn't need one). The dip-tube shouldn't quite touch the bottom of the tank and its end should be cut at a bit of an angle on one side.
It doesn't take much of a leak in a holding tank to stink up a boat. Not having any thru-hull fittings, except on the top of the tank, eliminates most of the potential for such leaks.
Never forget them. Do something to prevent it from happening again.
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Last edited by SlowButSteady; 12-17-2011 at 02:56 AM.