Yes, semi gas tank end. Thor (from MN) works on trucks, and had a couple tanks that needed replacing. He cut the ends off, and gave them to me. I spent an hour or so sanding and cleaning and BAM we have a great arena.
I gave one to Hayward in WI.....and Thor says he will have a couple more for me to work on soon.
Hopefully we can get a few made to pass around.