I've been on several boards looking for a solution and have found one so hope this helps. When you take the gas tube off, and there is the part that goes into the tube from the gas valve - you make a little O ring with wire or find a snap ring that will fit onto it and put it back together - here is a picture of it- hope I don't get in trouble sharing another site, but the picture made it clear for me. http://www.gunboards.com/forums/UltraBoard.cgi?action=Read&BID=7&TID=8567&SI D=1386099 if this doesn't come up it is on gunboards.com/forums - go to sks section- March 24 - post says - "Not another $99 Century Yugo SKS report - posted by J Bar - then scroll down till you see the picture. Hope this helps as I cann't find anyone who sells new gas tubes. Happy shooting! Let us know how it works for you.