The Wacker Neuson Water Separator is a genuine OEM Water Separator designed for the APT4S and APT4T pump series, including standard, cold weather, surge brake, and electric brake configurations. As a direct OEM replacement, the is sourced from Wacker Neuson and built to the same specification as the original component — ensuring it installs and functions exactly as intended. Compatible across six distinct APT4S and APT4T variants, this part covers a wide range of trailer-mounted pump setups without the need to source multiple SKUs.
Key Features
- Genuine OEM Filtration Integrity — Sourced directly from Wacker Neuson, this Water Separator meets the original moisture-removal and flow specifications required for correct pump fuel system operation.
- Drop-In Replacement — Matches the original mounting configuration and connections on APT4S and APT4T pumps, making swap-out straightforward on the jobsite or in the shop.
- Broad APT Series Coverage — Fits six APT4S and APT4T configurations, including standard, cold weather, surge brake, and electric brake variants — one part number covers the full lineup.
- Protects Engine and Fuel System — A functioning Water Separator keeps free water out of the fuel supply; a failed or saturated separator allows moisture through, which can cause injector damage, rough running, and hard starts.
- Fuel System Safety Compliance — Maintaining a correctly functioning Water Separator is critical in diesel fuel systems where water contamination can compromise combustion stability and increase the risk of unplanned shutdowns during operation.
A water separator is positioned in the fuel supply line to extract free water from diesel fuel before it reaches the engine. Water in diesel fuel can cause corrosion inside injectors, disrupt combustion, and lead to premature component wear. When the separator becomes saturated or damaged, water passes through unchecked — leading to rough engine operation, hard starting, or engine shutdown. Replacing it on schedule with a genuine OEM part like the Wacker Neuson 5200021617 keeps the fuel system clean and the pump running at full capacity.
Part Details
| Part Number | 5200021617 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Water Separator |
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.
