The Wacker Neuson 5200020166 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming trash pumps. This includes compatibility across standard, electric brake, surge brake, and cold weather configurations — covering the APT4S Pump with Skid, APT4S Pump with Skid Cold Weather, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, APT4T Pump with Surge Brake Cold Weather, and APT4T Pump with Electric Brake Cold Weather. As a genuine Wacker Neuson component, the 5200020166 is manufactured to the exact material and dimensional tolerances specified for these pumps. Replacing a worn or damaged O-Ring promptly keeps sealing integrity intact and prevents fluid loss or contamination at the joint it protects.
Key Features
- Genuine OEM Sealing Material: — Manufactured to Wacker Neuson's exact compound and durometer specification for the APT4 pump family, ensuring correct compression and seal life under pump operating pressures.
- Drop-In Replacement: — Dimensioned to seat directly into the original groove without stretching or trimming, maintaining the designed contact surface for a leak-free seal.
- Broad APT4 Series Coverage: — Fits APT4S and APT4T variants across surge brake, electric brake, and cold weather configurations — one part number spanning the full model range.
- Protects Pump Performance: — A correctly seated O-Ring maintains prime and prevents bypass leaks that would reduce discharge flow or cause the pump to lose suction entirely.
- Fluid Containment Integrity: — On a pump handling trash-laden water, a failed O-Ring can allow contaminated fluid to migrate into adjoining components; replacing with a genuine-spec seal maintains proper fluid path isolation.
An O-Ring is a circular elastomeric seal that sits in a machined groove between two mating surfaces, compressing to block fluid or air from passing through the joint. In a self-priming trash pump like the APT4S and APT4T, O-Rings are used at critical junctions throughout the fluid path and housing assembly to maintain prime and prevent leaks under continuous pumping pressure. When an O-Ring hardens, cracks, or becomes deformed from wear or chemical exposure, the seal fails — causing the pump to lose prime, leak at the joint, or allow contaminants to enter areas of the pump that should remain dry.
Part Details
| Part Number | 5200020166 |
|---|---|
| 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.
