... Certification6. Body Material: Aluminum Alloy, Cast Iron, Stainless Steel, Polypropylene7. Diaphragm Material: Buna-N, Neoprene, Viton, Teflon, EPDM Performance Parameter ModelDischargem ... decide by the of inlet air pressure, also, by the pipe that is connected to the pump, try to use large pipelines ... the working area and the work man.8.While new diaphragm is needed, do to clean the shaft and bushing ...