http://www3.towerhobbies.com/cgi-bin...RZ80&P=RF#tech


Only having one gasolene fueled engine a Brown Jr. I used a piece of the above and its seems to work well with none of the hardening I see with the tygon stuff. Its probably neoprene but not sure. Don,t know how well it would work on a clunk as its rather thick and my tank does not have a clunk.

John