The Wacker Neuson 5200021666 is a genuine OEM Adapter designed for the APT4T, APT4S, APT6T, APT6S, APT8T, and APT8S series trailer-mounted and skid-mounted pumps. As a direct OEM replacement, this adapter is manufactured to the same specifications as the original component, ensuring a correct, trouble-free installation across the full range of compatible APT configurations — including surge brake, electric brake, and cold weather variants. Whether you are servicing a skid-mount or tow-behind unit, part number 5200021666 is the correct replacement to restore your pump to proper working order. Always cross-reference your machine's model number before ordering to confirm fitment.
Key Features
- Genuine OEM Construction — Manufactured by Wacker Neuson to exact original tolerances, ensuring the adapter seats and seals correctly within the pump assembly without rework or shimming.
- Broad APT Series Coverage — A single part number covers APT4T, APT4S, APT6T, APT6S, APT8T, and APT8S configurations, including surge brake, electric brake, and cold weather variants.
- Direct Bolt-In Replacement — Matches the original mounting interface and thread pattern, allowing straightforward installation using standard service procedures for the APT pump family.
- Supports Proper Pump Flow Management — A correctly fitted adapter maintains the intended fluid path and connection integrity; a worn or damaged adapter can compromise pump output and cause leaks at the connection point.
- OEM Part Number Verified — Part number 5200021666 is sourced directly from Wacker Neuson, eliminating guesswork and ensuring you receive the exact component specified for your machine.
An adapter in a pump assembly serves as a precision connection fitting that bridges two components — typically joining a hose, pipe, or valve to the pump housing or discharge path — while maintaining a leak-free interface under working pressure. The adapter must conform exactly to the mating geometry on both sides; even minor dimensional deviation can result in fluid bypass, reduced output pressure, or connection failure during operation. When an adapter becomes cracked, corroded, or damaged at its seating surface, flow efficiency drops and the risk of leakage increases, making timely replacement essential to keep the pump performing as designed.
Part Details
| Part Number | 5200021666 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Adapter |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Surge Brake, Cold Weather | APT6T CW | 5200019794, 5200019795 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT6T Pump, Surge Brake | APT6T | 5200019646, 5200019647 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
| APT8T Pump, Electric Brake | APT8T | 5200019649, 5200019648 |
| APT8S Pump w/Skid | APT8S | 5200018987 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Electric Brake | APT4T | 5200019644, 5200019643 |
| APT8T Pump, Electric Brake, Cold Weather | APT8T CW | 5200019797, 5200019796 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| 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.
