AR303 & AR403 Diaphragm Kit
Part # AR43289 is the diaphragm kit for the AR303 and AR403 diaphragm pumps. This diaphragm kit will also work in the Hypro D403 Pump. When diaphragms rupture the oil in the reservoir will turn a milky color.
When replacing the pump diaphragms be sure to follow all factory torque specifications. A pump rebuild will also require the oil to be drained and replaced with 30-weight non-detergent oil.