Spaceworm... back at you again. I just opened the rebuild kit and might be seeing the tan teflon pump you mentioned. It looks as if there is a choice of three pumps in the kit. The traditional black rubber looking with combination of check valves and pump on same membrane, the acetate (which I know I'm not going to use) and the one I've never seen before is the tan fabric weave looking but it is a diaphragm only having no check valves but there is a black check valve membrane having no diaphragm.

Do I want to go with them in combination or the traditional black?