Diaphragm Rubber consists of Diaphragm and Diaphragm Ring which is main part inside Hiblow air pump. It is made of premium quality Synthetic rubber, EPDM (Ethylene Propylene). Moreover, it is high elastic and heat resistance. In general function, Diaphragm compresses air and keeps low noise. Diaphragm ring grabs or holds Diaphragm in firm shape all the time while working.