edrow
Active member
I will take a good pic of my drain fitting and post it. I would say i left about 1/16" of a lip on the thru hull fitting for the drain. Just enough to bite the edge of the tank to hold it in place. It took some fine filing on the tank hole to get my fitting bottomed out, but it worked well. I would say there may be 1/16" water at the most in it after I drain. Barely enough to cover the bottom of the tank. I am going to get a small squeege to help take care of that. I used JB marine weld and just put a small bead around the fitting before I secured it. It doesnt leak a drop. Keep in mind, if you use the nut for the drain fitting it will be down around 1/2" or so lower than the bottom of the tank.