Hi All,
I ordered wrap around muffler for my OS 120AX. I did't see this in the picture on their web site, but when the muffler showed up, I noticed there is no negative pressure nipple to push air pressure back in to the gass tank. My question is obviously, how do I set up the gas tank with out pushing air pressure back into the tank.

Every glow engine I had so far has a nipple that put pressure back into the gas tank.

Here is a link to the muffler.

http://www.jtecrc.com/oswraparound.htm

Thanks