AR 503 Diaphragm Kit, AR43295 Type_Tank Fittings H2 is the replacement diaphragm

H2 is the replacement diaphragm kit for the Udor RO-110/130 pumps

AR43278 - NBR

while current Udor literature identifies the complete drive configuration as ZETA 40P VAGR3/4

TeeJet 1/2" NPT Diaphragm-type pressure regulator valve

AR 503 Diaphragm Kit, AR43295 Type_Tank Fittings H2 is the replacement diaphragmPart # 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 replaces 9910 Kit1881 and 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.