The Wacker Neuson 5200021698 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming trash pumps. As a direct factory replacement, this O-Ring is produced to the same exacting tolerances as the original, ensuring a proper seal within the pump assembly. It is compatible across multiple APT4S and APT4T configurations, including cold weather, surge brake, and electric brake variants. Keeping the correct sealing component in place is critical to maintaining pump pressure and preventing fluid leakage during operation.
Key Features
- Precision Seal Geometry: — Manufactured to OEM dimensional tolerances, ensuring the correct compression fit within the pump housing mating surfaces.
- Genuine Wacker Neuson OEM Part: — Sourced directly from Wacker Neuson, this O-Ring matches the original material grade and durometer specification for the APT4 pump family.
- Broad APT4 Series Fitment: — Confirmed fit for APT4S Pump w/Skid, APT4T Pump with Electric Brake, APT4T Pump with Surge Brake, and all corresponding Cold Weather variants.
- Leak-Free Pump Performance: — A correctly seated O-Ring maintains internal pressure integrity, allowing the pump to prime efficiently and deliver full flow without fluid bypass or seal weeping.
- Drop-In Replacement: — Installs into the existing seat without modification, restoring the pump to its original sealed condition quickly during routine service or repair.
An O-Ring is a circular elastomeric seal that sits in a machined groove and creates a pressure-tight barrier between two mating surfaces within the pump assembly. In a self-priming trash pump like the APT4S and APT4T, O-Rings are used at critical fluid-path junctions to prevent air ingestion and water leakage, both of which directly affect the pump's ability to prime and maintain output pressure. When an O-Ring becomes cracked, compressed flat, or chemically degraded, the seal fails — allowing air to enter or fluid to escape, resulting in loss of prime, reduced flow, or visible leakage at the joint.
Part Details
| Part Number | 5200021698 |
|---|---|
| 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.
