The Wacker Neuson Cap with O-Ring is a genuine OEM component designed for the PDT3A, PDI3A, PDI3A(I), PDT2A, and PDI2A(I) pump diaphragm series. Sourced directly through Wacker Neuson's authorized parts program, this is the same cap and o-ring assembly that ships on new machines — no substitutions, no guesswork. Part number covers fitment across multiple diaphragm pump variants in this family, making it a go-to service part for technicians maintaining Wacker Neuson pump equipment.
Key Features
- Genuine OEM Sealing Integrity — O-ring material and cap geometry match the original specification, ensuring proper compression and a leak-free seal at the diaphragm housing.
- Drop-In Replacement — Seats and torques exactly like the factory-installed part, with no trimming or fitting adjustments needed during installation.
- Broad Pump Family Coverage — A single part number covers the PDT3A, PDI3A, PDI3A(I) Pump Diaphragm, PDT2A, and PDI2A(I) Pump models, consolidating your parts inventory.
- Maintains Diaphragm Chamber Performance — A correctly seated cap and o-ring keeps the diaphragm chamber properly pressurized; a worn or cracked o-ring can cause loss of prime, output drop, or fluid bypass.
- Fuel and Fluid System Compliance — As part of the pump's sealed fluid path, using the correct OEM cap and o-ring helps prevent unintended leaks that could create a hazardous working environment.
The cap with o-ring seals the diaphragm chamber on Wacker Neuson diaphragm pumps, holding internal pressure and keeping the pumped fluid contained within the correct flow path. The o-ring provides the compression seal between the cap and the pump housing, and when it degrades — through chemical exposure, heat cycling, or age — the pump can lose prime, leak fluid externally, or deliver inconsistent output. Replacing the cap and o-ring as part of routine diaphragm service restores the pump's ability to move fluid efficiently and keeps the diaphragm assembly operating as intended.
Part Details
| Part Number | 5100075504 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Cap with O-Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| PDT3A | PDT3A | 5100075507 |
| PDI3A | PDI3A | 5100075508 |
| PDI3A(I) PUMP DIAPHRAGM | PDI3A(I) | 5100075509 |
| PDT2A | PDT2A | 5100075510 |
| PDI2A(I) PUMP | PDI2A(I) | 5100075511 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
