... model: Stihl FS38,FS85,BG55 (Gasket & diaphragm set ZAMA GND-56) Metering Diaphragm description: Metering diaphragm is the most crucial part in the ... running. It is the most common spare part for the diaphragm carburetor. Our shaping mold was made in Japan,which ... extrude the diaphragm material as designed convolution at certain temperature, pressure and time ...