ARO 637309-TA 2" Diaphragm Pump Repair Kit
Santoprene diaphragm, PTFE ball kit for the 2" fluid end of ARO PD20A-AAP-HTA-B and -ATA-B pumps.
Santoprene and PTFE kit that rebuilds the 2" fluid end of ARO PD20A-AAP-HTA-B and PD20A-AAP-ATA-B pumps, including gasket and U-cup.
ARO 637309-TA services the 2" fluid section on PD20A-AAP series pumps. Unlike single-material kits, this one pairs Teflon (PTFE) balls with Santoprene diaphragms. The Santoprene diaphragm supplies the flex that drives each stroke, while the PTFE balls act as the check valves on the suction and discharge sides.
The notes list an O-ring, grease package, gasket, U-cup, ball and diaphragm in the kit. A U-cup is a lip seal, and gaskets and O-rings seal joints, so a rebuild with this kit renews key seals as well as the pumping parts. Keep the grease package for assembly, and follow the technical documents for the order of parts.
When a Rebuild Makes Sense
- Exhaust air carries pumped fluid with it.
- PTFE balls no longer seat cleanly and the discharge rate sags.
- Seals at fluid section joints start to weep.
PD20A Pumps for This Kit
Check that the nameplate model matches HTA-B or ATA-B as shown above.
| Brand | ARO |
|---|---|
| Product Type | Kit |
| Material - Diaphragm | Santoprene |
| Material - Balls | Teflon/PTFE |
| Notes | Service Kit (2" Diaphragm Pump Fluid Section), Includes: O-Ring; Grease Package; Gasket; U-Cup; Ball; Diaphragm |
