The Wacker Neuson Plug is a genuine OEM component designed for the APT4S and APT4T series water pumps, including standard, cold weather, surge brake, and electric brake configurations. As a genuine Wacker Neuson part, it is manufactured to the exact specifications of the original, ensuring a correct, trouble-free installation. This plug fits across the full APT4S and APT4T lineup, making it the go-to replacement whether you're servicing a skid-mounted unit or a cold weather-equipped pump.
Key Features
- Genuine OEM Construction — Manufactured by Wacker Neuson to the same tight tolerances as the original plug, ensuring a secure seal with no risk of leakage at the port.
- Drop-In Replacement — Threads directly into the original port with no reworking required, matching the original thread pitch and plug diameter exactly.
- Broad APT Series Fitment — Compatible with APT4S and APT4T pumps across surge brake, electric brake, and cold weather variants, covering a wide range of trailer-mounted pump configurations.
- Maintains Port Integrity — A correctly fitted plug keeps fluid passages sealed during operation and storage, preventing contamination ingress and preserving pump performance.
- Sourced Direct from Wacker Neuson — Carries the full backing of the Wacker Neuson parts program, so you can be confident the part number matches what left the factory.
A plug seals an unused or service port on the pump housing, preventing fluid from escaping and stopping debris or moisture from entering the internal fluid circuit. On trailer-mounted water pumps like the APT4S and APT4T, maintaining sealed ports is essential to keeping hydraulic or fluid pressure stable and the pump running cleanly. A missing, damaged, or incorrect plug can lead to fluid loss, contamination, or pressure drop — all of which compromise pump output and can cause premature wear to internal components.
Part Details
| Part Number | 5200020104 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Plug |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
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.
