I have had some problems with my DA50. The membranes seemed to be hardened, so I bought a new gasket replacement set from Oregon for this model of walbro carb. This set includes a lot of gaskets, the ones I need and others to be dispossed. But there are two with the same shape made of different materials (the gasket that has to be installed in the oposite side of the pump) There are two, one of them is browm, made of something like plastic. The other seems to be kevlar, or something similar.

The one that cames with my DA is like the brown one, but I have also two MVVS 45 (same carb as DA) that includes a kevlar-like gasket. Does anybody know which is the difference betwee both types? Wich one works better for our pourposses?

Thanks,
Javier