It is actually a walbro wt 501 carb of off a weedeater blower, the kit is a K20-WAT it does only come with one metering diaphram, but comes with 2 fuel pump diaphrams one is made of the same material as the metering diaphram and the other is a white woven type of material or at least that is the best way I can describe it, I have seen other kits come with a plastic mylar type fuel pump as well. I would like to post pics to show you what I'm talking about but I 'll have to get some to show me how to get the pics of of my camera I'm not the swiftest at downloading pics to the computer,sorry.