Here’s some pics. First is the modified pump. Second shows (kinda) the stock gasket. Fits pretty snug once pump is all the way in. The others show the flanges I’m working on. The one with slit will have threaded holes that I will run stainless bolts with rubber washers through. It will go inside the tank with a rubber gasket. The other ring will hold the pump down. Trying to decide how many bolts to use. I was thinking about 7, but the more holes the more chance of leaking.