The Wacker Neuson 5200020137 is a genuine OEM O-Ring designed for APT4S and APT4T series self-priming pumps, covering standard, cold weather, surge brake, and electric brake configurations. As a factory-sourced component, it is manufactured to the exact material and dimensional specifications required for a leak-free seal in these pump assemblies. This O-Ring is a direct fit across the full APT4S and APT4T lineup, including skid-mounted and trailer-mounted variants. Keep a replacement on hand — O-Rings are a common service item during pump maintenance and inspection intervals.
Key Features
- Genuine OEM Sealing Integrity — Manufactured to Wacker Neuson's exact material compound and dimensional tolerances, ensuring the correct compression set and fluid-tight seal within the pump assembly.
- Drop-In Service Replacement — Seats into the original O-Ring groove without modification, maintaining the factory sealing surface and mating face alignment.
- Broad APT Series Coverage — Confirmed fitment across APT4S Pump with Skid, APT4T Pump with Surge Brake, and APT4T Pump with Electric Brake, including all cold weather variants.
- Prevents Pump Fluid Loss — A worn or compromised O-Ring allows fluid bypass at critical sealing points, leading to pressure loss and reduced pump output. Replacing on schedule keeps the pump operating at full capacity.
- Fuel and Fluid System Compliance — Using the correct OEM-grade O-Ring material is essential in pump applications where chemical compatibility with the pumped fluid directly affects seal longevity and system safety.
An O-Ring is a precision loop of elastomeric material that forms a compression seal between two mating components in a pump assembly. In the APT4S and APT4T pumps, O-Rings are used at critical fluid-path junctions to prevent leaks under pressure and during suction cycles. When an O-Ring degrades — through compression set, chemical exposure, or mechanical wear — it loses its ability to maintain a consistent seal, resulting in fluid bypass, pressure drop, and potential pump damage if left unaddressed.
Part Details
| Part Number | 5200020137 |
|---|---|
| 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.
