The Wacker Neuson 5200020152 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming pumps. As a factory-sourced replacement, this seal is manufactured to the exact material grade and dimensional tolerances specified for these pump models, ensuring a proper compression fit within the sealing interface. This O-Ring is compatible across multiple APT4S and APT4T configurations, including surge brake, electric brake, cold weather, and skid-mounted variants. Keeping a fresh replacement on hand helps maintain pump integrity across demanding dewatering and fluid transfer applications.
Key Features
- OEM-Grade Seal Material — Manufactured to the exact compound and durometer specification required for pump sealing duty, resisting fluid degradation and compression set over repeated service cycles.
- Drop-In Replacement — Dimensioned to seat directly into the original groove geometry on APT4S and APT4T pump assemblies without modification to mating components.
- Broad APT Series Compatibility — Fits APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and all corresponding Cold Weather variants.
- Maintains Pump Prime and Pressure — A correctly seated O-Ring preserves the sealed hydraulic boundary that allows these self-priming pumps to build and hold suction; a worn or cracked seal leads to prime loss and reduced flow output.
- Fluid-System Integrity — In pump and fluid-handling applications, a failed O-Ring can allow external leakage at pressurized joints; using the correct OEM-spec seal supports safe, leak-free operation.
An O-Ring is a looped elastomeric seal installed between two mating surfaces — typically a housing, flange, or port — to prevent fluid from escaping at the joint. In a self-priming pump like the APT4S and APT4T, O-Rings maintain the airtight and fluid-tight boundaries that allow the pump to draw suction and deliver flow under pressure. When an O-Ring deteriorates — through chemical exposure, heat cycling, or simple age — it loses its ability to compress and seal evenly, resulting in air ingestion, prime loss, or visible fluid leakage at the joint. Replacing a worn O-Ring with the correct OEM part restores the sealing performance the pump was engineered to deliver.
Part Details
| Part Number | 5200020152 |
|---|---|
| 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.
