The Wacker Neuson 5200020018 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming trash pumps, including Cold Weather and standard configurations. As a factory-sourced component, this O-Ring is manufactured to the exact material grade and dimensional tolerances specified for these pumps, ensuring a proper fluid-tight seal at every installation point. It covers a broad range of APT4 variants, including Surge Brake, Electric Brake, and Cold Weather models across both the APT4S and APT4T platforms. When your existing seal shows signs of cracking, compression set, or weeping, replacing it with part number 5200020018 restores leak-free performance without guesswork.
Key Features
- Genuine OEM Seal Material — Manufactured to Wacker Neuson's specified elastomer compound and durometer rating, ensuring correct compression and sealing performance in a trash pump operating environment.
- Drop-In Replacement — Dimensioned to seat directly in the original groove, requiring no trimming or adaptation during reinstallation.
- Broad APT4 Platform Coverage — Fits APT4S and APT4T pump variants including Surge Brake, Electric Brake, and Cold Weather configurations.
- Maintains Prime and Flow Integrity — A properly seated O-Ring prevents air ingestion and fluid bypass, allowing the pump to build and hold prime consistently across demanding transfer and dewatering applications.
- Fuel and Fluid System Compliance — Using the correct OEM-spec seal material helps prevent chemical incompatibility with pump fluids, reducing the risk of premature seal degradation or unexpected leaks.
An O-Ring serves as a static or dynamic sealing element between mating pump components, preventing fluid or air from bypassing the intended flow path. In a self-priming trash pump like the APT4S and APT4T, maintaining an airtight and leak-free seal is critical to the pump's ability to draw and sustain prime, particularly when handling abrasive or debris-laden fluids. When an O-Ring hardens, deforms, or loses its cross-section due to wear or chemical exposure, the resulting leak path can cause the pump to lose prime, run dry, or deliver reduced flow — all conditions that cut productivity and can accelerate wear on other pump components.
Part Details
| Part Number | 5200020018 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
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.
