Weasel. Good point. Of course, I now have a 8oz and 10oz Dubro collecting dust but I guess I should have measured F-2 before buying the 10oz.

Is there an advantage to rectangle versus cylinder? The Sullivan [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&W=001603520&I=LXFU38&P=K]tank[/link] shaped like a cylinder looks like it will just fit.

It looks like the bung will be 1/4" to 1/2" lower with cylinder (it is centered versus at top of rectangle).