ARO 637309-TT PTFE/Santoprene Diaphragm Pump Repair Kit

Built for the larger PD20 family, the ARO 637309-TT repair kit covers PD20A and PD20S double diaphragm pumps that carry the TT material code. The diaphragm is listed as PTFE/Santoprene, a two-material construction, and the balls are Teflon/PTFE.

In a PD20 pump the diaphragms do the pumping and the balls act as one-way check valves at the inlet and outlet. This kit lets you renew both groups in a single service.

When This Kit Is Needed

• Product shows up in the exhaust air, pointing to diaphragm failure.
• The pump runs but output has fallen off, often from worn or swollen check balls.
• A PD20 pump is due for teardown after long service on its current wetted parts.

Fits These ARO Pumps

• ARO PD20A-AAP-KTT-B
• ARO PD20A-ACS-STT-B
• ARO PD20A-BSS-KTT-B
• ARO PD20A-AAS-FTT-B
• ARO PD20S-ASS-KTT-B
• ARO PD20S-FSS-STT-B
• ARO PD20A-ACP-KTT-B
• ARO PD20A-BAS-FTT-B

Another 4 pump models appear on the full fit list. Check the code on the nameplate against that list.