FYI I received the Zama Diapragm kits today. the -12 kit came with 2 different diaphragms for the pump. One is an exact replacement and the other seems to be a fiberglass material that is almost the same color as the original but definitely a different material. Obviously I opted for the new mateiral. I think the replacement regulator diaphragm is a different material but I cannot be sure. It is the same color as the original but the texture is a bit different, that is before it sees fuel. The -27 kit has a clear pump diaphragm and an exact replacement too. I don't think the clear one is mylar more likely fiberglass as it has the texture of fiberglass. I'll give it a whirl this weekend and post results.