The Wacker Neuson 5200021688 is a genuine OEM O-Ring designed for the APT4S, APT4T, APT6S, and APT6T submersible pump series. As a direct OEM replacement, part 5200021688 is manufactured to the exact material grade and dimensional tolerances specified for these pumps, ensuring a proper seal every time. This O-Ring covers a broad range of APT-series configurations, including skid-mount, surge brake, electric brake, and cold weather variants across both the 4-inch and 6-inch pump families.
Key Features
- Exact-Grade Sealing Material — Manufactured to the precise compound specification required for the APT pump series, maintaining seal integrity under submersible operating conditions.
- Direct OEM Replacement — Seats and compresses exactly as the original, with no trimming or adaptation needed during reinstallation.
- Broad APT-Series Coverage — A single O-Ring fits APT4S, APT4T, APT6S, and APT6T pumps across surge brake, electric brake, skid-mount, and cold weather configurations.
- Leak Prevention — A worn or degraded O-Ring allows water or fluid ingress into sealed pump cavities, leading to premature bearing wear and motor damage; replacing it promptly protects the entire pump assembly.
- Genuine Wacker Neuson OEM Part — Sourced directly through the Wacker Neuson parts network, so part number 5200021688 matches the original specification without substitution or compromise.
An O-Ring is a precision-molded elastomeric seal that sits in a machined groove between two mating components, creating a pressure-tight barrier against fluid or air passage. In a submersible pump like the APT4T or APT6S, O-Rings are critical to keeping water out of motor housings and other protected cavities, as well as maintaining internal hydraulic pressure where required. When an O-Ring becomes cracked, flattened, or chemically degraded, the seal fails — allowing fluid intrusion that can rapidly damage bearings, windings, and other internal components.
Part Details
| Part Number | 5200021688 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Electric Brake | APT6T | 5200019647, 5200019646 |
| APT6T Pump, Electric Brake, Cold Weather | APT6T CW | 5200019795, 5200019794 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| 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 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
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.
