I have a Masterbuilt 2 door dual fuel smoker, that I've been struggling with. Ever since the weather got warmer I can not keep my temps low. I would watch the temp climb over 300*, usually stopping around 310*.After searching the forum and reading idea, after idea, I went ahead and ordered a needle valve to put in the propane line. Turns out I also needded a few more fittings than just the valve. I believe Dirtsailor has or knows of a kit that might be easier. And I have got to say, if your worried that it won't make that big of a difference, I am now able to stabilize my smoker at 180* for twenty minutes. The 180* is the bottom prob and the 172* is the upper. Since the smoker was stabilized I didn't feel the need to go longer than 20 minutes. I'm sure at that temp of 180* I will have problems with blow out, but the difference is huge! If your having the same problem, give it a try. With all the parts it was about $30, well worth it!