Join Date: Jan 2003
Location: Maine Coast
Thanked 222 Times in 169 Posts
Rep Power: 16
Manual pumps are generally more reliable but should ideally keep 1 1/2" all the way to and including the thru-hull. Most 12V macerators are a 1" outlet. The line will be full anyway. If the tank is full liquid always levels itself and the drain line is off the bottom of the tank unless you tank uses a dip tube design..
-Maine Sail / CS-36T
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Last edited by Maine Sail; 05-15-2011 at 07:39 PM.