AR 503 Diaphragm Kit, AR43295
Part # AR43295 is the diaphragm rebuild kit for the AR 503 diaphragm pump. AR recommends changing the diaphragms every 500 hours or three months, whichever comes first.
Part# AR43295 will also rebuild the Hypro D503 pump.
When rebuilding the pump diaphragms follow all factory torque specifications. Replacing diaphragms will require new oil. Replace with 30 weight non-detergent.