I have high scoop pick up over a through hull, through hull goes into a backing plate, bait sentry pump screws right into top of through hull.
The large thru-hull you can see in this picture is a large drain, the small one in front if the baitwell pick up before putting on the pump.
All are Marleon made by Forespare, super strong, no corrosion, no electrolysis
http://gallery.bateau2.com/albums/us..._shine_667.jpg