ARO 637401-TC EXP Service Kit, Hytrel Diaphragm and PTFE Balls

The ARO 637401-TC is an EXP service kit built around a Hytrel diaphragm and Teflon/PTFE balls. It is listed for the PD10A-AAP-STC, and the TC suffix of the kit lines up with the STC ending of that pump code.

Hytrel is a tough thermoplastic elastomer that handles repeated flexing. PTFE is chemically inert and stiff, which suits a ball that has to close against a seat many times a minute. Together they cover the two parts that wear fastest in the fluid path.

When to Use This Kit

• The muffler or exhaust port starts to discharge liquid along with air.
• Output pressure fades and the pump can no longer move fluid to the end of the line.
• You are already opening the PD10A for maintenance and want fresh wear parts in place.

Fits These ARO Pumps

The PD10A model below is the only pump our parts data pairs with this kit:

• ARO PD10A-AAP-STC Double Diaphragm Pump

Technical documents are available for this kit.