Aro 637137-63-C Fluid End Repair Kit Acetal Ball 4 Check Balls 2 Diaphragms 14 O-Rings 14 Seals

Fluid End Repair Kit for AODD Pumps

This Aro 637137-63-C kit restores the fluid section of compatible air-operated double-diaphragm pumps. It supplies all wear components in one package for maintenance teams managing Grainger 3P785 or manufacturer 650717-C pump models. The kit suits facilities that perform scheduled rebuilds to prevent unplanned downtime. It is not for buyers who need pump housings, air motors or complete pump assemblies.

Media Intake Pressure Limited to 50 psi

The kit is rated for a maximum media intake pressure of 50 psi, making this figure the primary check before installation. Four acetal check balls, two FKM diaphragms, fourteen O-rings and fourteen seals are included to match the original fluid-end configuration. Verify the pump's operating pressure against this limit before ordering. Do not use this kit on systems that exceed the stated pressure rating.

FKM Diaphragms Handle -40 °F Minimum Temperature

FKM diaphragm material remains functional down to a minimum media temperature of -40 °F, supporting cold-environment operation. Acetal check balls and the supplied elastomers are selected for chemical compatibility with typical AODD pump media. The kit contains no moving mechanical parts, so it adds no noise or power draw during normal pump cycling. Install according to the pump manufacturer's torque and lubrication guidelines.