ARO 637375-ST 1-1/2 in. Fluid Section Service Kit, PTFE/Santoprene
Fluid section service kit for 1 1/2 in. ARO diaphragm pumps: PTFE/Santoprene diaphragms, 316 SS balls
Rebuild the fluid section of a 1 1/2 in. ARO diaphragm pump with this kit. It pairs PTFE/Santoprene diaphragms with 316 stainless steel balls.
The ARO 637375-ST renews the fluid section of a 1 1/2" ARO diaphragm pump. It is built around PTFE/Santoprene diaphragms and 316 stainless steel balls. According to the spec notes, the kit holds a grease package, gasket, U-cup, O-ring, ball and diaphragm.
The fluid section is the wetted half of an air-operated diaphragm pump. Diaphragms push product through the chambers, while the balls lift and drop to let fluid in and out. Replacing these parts together restores both sides of the pump in one teardown.
When to Use This Kit
- Suction or flow has dropped while the air supply is unchanged.
- Fluid appears at the air exhaust, a common sign of a split diaphragm.
- The pump strokes unevenly or stalls because the balls no longer seal.
Fits These ARO Pumps
Our parts data links this kit to five pumps:
Before you order, compare the model code on your pump nameplate with this list.
| Brand | ARO |
|---|---|
| Product Type | Kit |
| Material - Diaphragm | PTFE/Santoprene |
| Material - Balls | 316 Stainless Steel |
| Notes | Service Kit (1 1/2" Diaphragm Pump Fluid Section), Includes: Grease Package; Gasket; U-Cup; O-Ring; Ball; Diaphragm |
