The Wacker Neuson 5200020156 is a genuine OEM O-Ring designed for APT4S and APT4T series self-priming trash pumps, including standard, electric brake, surge brake, and cold weather configurations. As a factory-sourced seal component, it meets the exact material and dimensional specifications required for a proper pressure-tight fit in these pump assemblies. This O-Ring is the correct replacement for APT4S Pump with Skid, APT4T Pump with Electric Brake, APT4T Pump with Surge Brake, and their respective cold weather variants. Verifying your machine's model number against the fitment list before ordering ensures a direct, trouble-free installation.
Key Features
- Genuine OEM Seal Material — Manufactured to Wacker Neuson's exact compound and durometer specifications, ensuring the O-Ring seats and compresses correctly under operating pressures found in APT-series pump systems.
- Drop-In Replacement — Matches the original groove profile and cross-section dimensions, so the O-Ring drops into its seat without trimming, stretching, or adapting.
- Broad APT-Series Coverage — Fits the full range of APT4S and APT4T configurations: standard, electric brake, surge brake, and cold weather variants, covering six distinct machine configurations under a single part number.
- Leak-Free Pump Operation — A properly seated O-Ring maintains the internal pressure needed for consistent priming and fluid transfer; a worn or cracked seal causes pressure loss, poor priming performance, and fluid leaks at the joint it protects.
- Fuel and Fluid System Integrity — In pump applications, seal failure can allow fluid contamination or loss of prime, making correct O-Ring replacement critical to safe and effective pump operation.
An O-Ring is a circular elastomeric seal that sits in a machined groove between two mating surfaces, creating a pressure-tight barrier that prevents fluid or air from escaping a joint. In self-priming trash pumps like the APT4S and APT4T, O-Rings are used at key connection points to maintain the suction and discharge integrity the pump depends on to move water and solids efficiently. When an O-Ring hardens, cracks, or becomes compressed beyond recovery, the seal fails — leading to air ingestion, loss of prime, or visible fluid leaks that interrupt pump performance and can accelerate wear on surrounding components.
Part Details
| Part Number | 5200020156 |
|---|---|
| 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.
