... 3:stand strong collision 4:customized 5: diaphram with rubber,long lifetime Features: MaterialNBR,HNBR, MVQ, ... , low temperature resistance, ozone resistance... )Color black, red, white, green, yellow, blue, brown, according to customers'requirementsWeight0 ... green products Strong pointWe have our own mold center, can develop most kinds of high tech required molds. Black rubber diaphragm with ...