Fit engine model: Stihl FS38,FS85,BG55 (Gasket & diaphragm set ZAMA GND- ... stability, repeatability, endurability and difference on the various pose when engine is running. It is the most common spare part for ... /NBR/Fiber glass), according to required temperature,pressure,two or four cycle engine, and resistance of oil,corrosion and wear. The punching ...