I have a colman 425 GREEN suitcase stove. Both burners work great together. First burner works great. But after a little use the second burner starts to leak gas a bit and you can smell it, and see it. I can open the key valve for the second burner and use it just fine, but it is smelly when you only use one burner. I can see the threads going into the second burner but can't tighten it more to make it actually shut off when only use 1 burner. I would have thought to use Teflon tape but it get so hot under there I don't want to melt it or what else to try. The gas seems to come out the burner not at the valve though.