The Wacker Neuson is a genuine OEM O-Ring designed for PT3A, PT4A, PT3A(I), and PT4A(I) series self-priming centrifugal trash pumps. Sourced directly from Wacker Neuson, this part meets the original engineering specifications for your machine. It is a direct-fit replacement that installs in the same position as the factory original, requiring no modification to surrounding components. Confirming your model number against the fitment list before ordering ensures you receive the correct seal for your specific pump configuration.
Key Features
- OEM Sealing Integrity — Manufactured to the original elastomer compound and dimensional tolerances, ensuring a consistent, pressure-rated seal in your pump's fluid path.
- Drop-In Replacement — Engineered to seat in the original groove geometry of PT3A and PT4A series pumps, including indirect-fired variants, with no reworking of mating surfaces.
- Broad PT-Series Fitment — Confirmed compatibility across PT3A, PT4A, PT3A(I), and PT4A(I) trash pump models, covering both standard and indirect configurations.
- Leak Prevention — A correctly seated O-Ring maintains pump prime and internal pressure; a cracked or swollen O-Ring leads to fluid bypass, loss of suction, and pump cavitation.
- Fluid System Safety — Proper sealing prevents uncontrolled fluid leakage at connection points, which is critical when pumping wastewater or chemically active fluids on a worksite.
An O-Ring is a circular elastomeric seal seated in a machined groove between two mating pump components. Its job is to create a leak-free barrier that holds internal pressure and prevents fluid from escaping around joints, ports, or housing interfaces. In a self-priming trash pump like the PT3A and PT4A series, maintaining that seal is essential — a compromised O-Ring allows air ingestion or fluid bypass that breaks pump prime, reduces flow output, and can lead to premature wear on the impeller and volute. Replacing a worn or damaged O-Ring promptly restores the sealed fluid path and keeps the pump operating at its rated capacity.
Part Details
| Part Number | 5100044509 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| PT3A | PT3A | 5100042216 |
| PT4A | PT4A | 5100042217, 5100042604 |
| PT3A(I) | PT3A(I) | 5100042614 |
| PT4A(I) | PT4A(I) | 5100042615 |
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.
Wacker Neuson
O-Ring (Top Cover)| PT3 - 5100 Series, PT4 - 5100 Series
