ARO 637373-TT PTFE Fluid Section Repair Kit

ARO 637373-TT is the PTFE choice within the 637373 kit series. Its diaphragm material is listed as PTFE/Santoprene, a two-material construction, and the check balls are Teflon (PTFE). The TT code ties it to the PD20P-FPS-PTT and PD20P-FKS-KTT pumps.

In two-piece diaphragm designs of this type, the PTFE layer typically faces the pumped fluid while the elastomer behind it provides flex. PTFE balls seat against the valve seats to hold flow in one direction. Refer to the operator's manual for the exact parts this kit replaces in your pump. Our data does not list kit contents for this variant.

Time to Replace?

• Product is visible in the exhaust, or the muffler is wet.
• Ball checks no longer seal, so the pump runs but moves little fluid.
• The pump cycles fast without load, a sign it has lost suction.

ARO Pumps This Kit Fits

• ARO PD20P-FPS-PTT
• ARO PD20P-FKS-KTT

Use the model code from the pump nameplate to confirm a match.