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Yep. Always use cheap stuff for the prototype. Especially if you're like me and get to the Mk 3 (or later) version before you're happy with it. I recently got to the Plan C Mk 3 version for my autopilot motor mounting position... FKT

Cardboard works, or thin doorskin ply hot glued together. Second the requirement for a big dump valve, mine is 50mm and attached via a bolted flange on the hull side with a union on the tank side to eliminate those annoying 'clocking' issues where things don't quite do up tightly enough with...

Mine is welded grey PVC. So far no problems, no smells etc. Gravity drains via a ball valve which is lined up with the deck pump out fitting so you can rod it if there's a blockage. FKT