GRACO 25A873 - Husky 3300 Seat, Ball & Diaphragm Kit (SST/PTFE/Santoprene)
The GRACO 25A873 is a complete fluid-section service kit for the Husky 3300 air-operated diaphragm pump, with stainless steel seats, PTFE check balls, and Santoprene diaphragms. It rebuilds the entire wetted path in one kit — seats, balls, diaphragms, O-rings, adhesive, and install tool.
Specifications
| Specification | Detail |
| Seats | Stainless steel (4) |
| Check balls | PTFE (4) |
| Diaphragms | Santoprene (2) |
| O-Rings | PTFE |
| Adhesive | Included |
| Fits pumps | Husky 3300 (SST/PTFE/SP build) |
Kit Contents
| Ref. | Description | Qty |
| — | Seat, stainless steel | 4 |
| — | Check ball, PTFE | 4 |
| — | Diaphragm, Santoprene | 2 |
| — | O-Ring, PTFE (seat/manifold) | 8 |
| — | O-Ring, PTFE (shaft bolt) | 2 |
| — | Adhesive | 1 |
| — | Install tool | 1 |
Installation Notes
- AIR SIDE markings on the diaphragm must face the center housing.
- Torque the diaphragm bolt to 110-120 ft-lb (149-163 N•m) at 100 rpm maximum.
- Apply the supplied adhesive per manual 3A0411; see the manual for the full fluid-section rebuild procedure.
Compatible Equipment
- Husky 3300 Air-Operated Diaphragm Pumps (stainless steel seat / PTFE ball / Santoprene diaphragm configuration)
Related Parts
Other Husky 3300 seat, ball & diaphragm kits:
- 25A871 - Santoprene Seats/Balls/Diaphragms (SP/SP/SP)
- 25A872 - Geolast Seats/Balls/Diaphragms (GE/GE/GE)
- 25A874 - TPE Seats/Acetal Balls/TPE Diaphragms (TP/AC/TP)
- 25A875 - Aluminum Seats/PTFE Balls/2-Piece Diaphragms (AL/PT/PT)
Standalone diaphragm kit: 24K905 - PTFE/Santoprene two-piece diaphragm kit
Reference Manuals
- 3A0411 (Page 37) - Husky 3300 Air-Operated Diaphragm Pump, Repair/Parts
- 406958 (Page 1) - Two-Piece Bolt-Through Diaphragm Kit (24K905, 25A873, 25A875), Husky 3300