Thank you .... The tank is 3 piece, the center piece is rolled at the bends. I made this from stainless steel and did not coat the interior. Next time I'll use aluminum to save weight but I had some ss sheets in the scrap bin. I started with a cardboard mockup and transferred the dimensions to the sheets. I used a TIG to do the welds. As far as the bung and cap I can't remember where i got them, some motorcycle place. Might I suggest : make the tank wide enough to mount the bung on the top of the tank ( I'll do that next time ).