15-3100-01-225 is the aluminum center block on the Wilden T15 — the hub that the air valve, shaft and both chambers all attach to.
| Material | Aluminum |
|---|
Part 15-3100-01-225 is the aluminum center block on the Wilden T15, the structural hub that the air valve, the shaft and both liquid chambers all bolt onto. Because so much depends on it mechanically, damage here rarely stays contained to one spot — it tends to surface as a problem somewhere else first.
Air leaking between the chambers, a joint that won’t seal no matter how many times it’s reassembled, or a pump that’s quietly lost performance for no clear reason — all three can trace back to the center block rather than whatever part looks obviously worn. Scoring inside the shaft bore, cracks near the mounting points, and stripped threads are the specific things to check for.
Whether it needs full replacement or just new seals comes down to the shaft bore: smooth and undamaged generally means seals will do the job, while a scored bore or a cracked body means the block itself has reached the end of the road. No seal, however good, makes up for a damaged sealing surface underneath it.
Genuine Wilden AODD Diaphragm Pumps & Spare Parts15-3520-52 is the Buna-N center block gasket on the Wilden T15. Cheap, easy to overlook, and often blamed on other parts when it leaks.
Genuine Wilden AODD Diaphragm Pumps & Spare Parts15-3210-55-225 is the PTFE Glyd Ring sealing the T15’s shaft at the center block. A high-wear part on any pump running heavy duty cycles.
Genuine Wilden AODD Diaphragm Pumps & Spare Parts15-6850-08 is the inner piston back-up washer on the Wilden T15 (position 18), made from mild steel — small, cheap, and easy to skip by mistake.
