Dennis - I'm using your msg as a reference here - NOT directed TO you - but it supports the point I was attempting to make in my feeble effort about stoppers. Generally, "gas" stoppers work, and pretty well for a good long time, They aren't made to last forever. Problem is, you buy a SULLIVAN tank, the stopper is RED, then it's for GLOW. Buy a DuBro tank, the stopper is BLACK, then it's for GLOW.
So, Newbie or Not Newbie, we buy the "after market" stopper that is correct for gas - Sullivan is BLACK, Dubro is RED. They work just DANDY.
Problem is once installed, you can't tell by looking whether it's a Dubro or Sullivan stopper in the tank of that Gasser you just bought.
Or, you may be a bit like me, and can't remember...Did I use a Dubro or a Sullivan on that last ARF ???

My point, and again - not directed at you Dennis, or anyone else - is that something as simple as a tank stopper setup is "something" that the person who is new to gas has to learn about. Just like having to learn about why that yellow Tygon gas line is to be avoided, or not used altogether because of various shortcomings in different types of gas fuel line setups.

There is a LOT of "Stuff to Know" for anyone coming into GAS powered engines from Nitro....