The Wacker Neuson 5200021697 is a genuine OEM O-Ring designed for the APT4S and APT4T series submersible pumps, covering both standard and cold weather configurations. As a factory-sourced seal, this O-Ring is manufactured to the exact material grade and dimensional tolerances specified for these pump models, ensuring a proper compression fit at the sealing point it serves. Wacker Neuson genuine OEM parts are produced to the same standards as the original components installed at the factory, giving you confidence that part number 5200021697 will perform as intended across the full range of compatible APT4 variants. Compatible models include the APT4S Pump with Skid, APT4S Pump with Skid Cold Weather, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and their corresponding cold weather variants.
Key Features
- OEM-Grade Seal Material — Manufactured to the exact compound and compression specification required for APT4S and APT4T pump sealing applications, maintaining integrity under continuous submersible pump operating conditions.
- Drop-In Replacement — Matches the original O-Ring profile and cross-section exactly, seating correctly into the intended groove without modification to adjacent components.
- Broad APT4 Series Coverage — Compatible with APT4S and APT4T models across surge brake, electric brake, and cold weather configurations, making it the correct choice for the full APT4 pump family.
- Leak Prevention — A properly seated O-Ring maintains the fluid-tight seal critical to pump performance; a worn or damaged O-Ring can cause leaks that compromise suction, reduce output pressure, and introduce contaminants into sealed housings.
- Fluid System Integrity — In pump and hydraulic applications, using the correct OEM seal material prevents chemical incompatibility that can cause premature swelling, cracking, or seal failure in service.
An O-Ring is a circular elastomeric seal that sits in a machined groove between two mating surfaces or components, creating a pressure-tight barrier that prevents fluid or air from passing through the joint. In a submersible pump like the APT4S and APT4T, O-Rings are used at critical connection points to keep water out of sealed housings and to maintain the internal pressure integrity needed for efficient pumping. When an O-Ring degrades — through compression set, chemical attack, or physical damage — it loses its ability to seal correctly, leading to leaks, reduced pump efficiency, and potential damage to internal components if contaminants are allowed to enter.
Part Details
| Part Number | 5200021697 |
|---|---|
| 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.
