The Wacker Neuson 5200020170 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming pumps. Sourced directly from Wacker Neuson, this O-Ring delivers the exact material grade and dimensional spec required to maintain a proper fluid-tight seal in these pump assemblies. It is compatible across multiple APT4S and APT4T configurations, including cold weather, surge brake, and electric brake variants. Keeping this seal in serviceable condition is essential to pump performance and preventing fluid loss at critical connection points.
Key Features
- OEM-Grade Seal Material — Manufactured to Wacker Neuson's specified compound and dimensional tolerances, ensuring correct compression and sealing performance at the mating surfaces.
- Drop-In Replacement — Seats directly into the original groove with no trimming or adaptation, maintaining the original sealing geometry of the pump assembly.
- Broad APT Series Coverage — Fits APT4S Pump with Skid (standard and cold weather), APT4T Pump with Surge Brake, and APT4T Pump with Electric Brake (standard and cold weather) configurations.
- Prevents Fluid Loss — A worn or cracked O-Ring allows fluid to bypass the seal, leading to pressure loss and potential pump damage. A fresh OEM O-Ring restores the integrity of the sealing point immediately.
- Genuine Wacker Neuson Part — Part number 5200020170 is verified against Wacker Neuson parts documentation, so you can order with confidence that this is the correct component for your machine.
An O-Ring is a circular elastomeric seal that sits in a machined groove between two mating surfaces, creating a fluid-tight barrier when compressed. In self-priming pump assemblies like the APT4S and APT4T, O-Rings are used at critical joints to prevent water or fluid from escaping the pressurized flow path. When an O-Ring ages, it can harden, crack, or lose its cross-sectional shape, causing the seal to fail — resulting in leaks, loss of prime, and reduced pump output. Replacing a worn O-Ring promptly restores the pump's ability to build and hold pressure correctly.
Part Details
| Part Number | 5200020170 |
|---|---|
| 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.
