The Wacker Neuson Volute is a genuine OEM Volute designed for the APT4S and APT4T series submersible pumps, including standard and Cold Weather variants. As a genuine Wacker Neuson part, the is manufactured to the same specifications as the original component installed at the factory, ensuring a direct, correct-fit replacement. This Volute is confirmed to fit across the full APT4S and APT4T model range, covering surge brake, electric brake, and skid-mounted configurations. When your pump needs service, sourcing the right OEM part the first time keeps your equipment performing as intended.
Key Features
- OEM-Grade Hydraulic Path Integrity — Cast and finished to the same dimensional tolerances as the original, preserving correct flow velocity and pressure characteristics within the pump housing.
- Direct Housing Replacement — Mounts directly to the pump impeller and casing assembly with no modification; ports and bolt patterns match the original installation exactly.
- Broad APT Series Coverage — Fits APT4S (with Skid) and APT4T (Surge Brake, Electric Brake, and Cold Weather) pump models, making this a single part number for the full APT4 pump family.
- Restores Full Pump Output — A worn or cracked volute causes pressure loss, reduced flow rate, and excessive cavitation; replacing it with part 5200021722 restores rated pumping performance.
- Genuine Wacker Neuson OEM Part — Sourced directly through the authorized Wacker Neuson parts network, so you receive an unmodified, traceable replacement component.
The volute is the curved, snail-shaped housing that surrounds the impeller inside a centrifugal pump. As the impeller spins, the volute converts the high-velocity water leaving the impeller blades into usable pressure by gradually expanding the flow path — slowing the fluid and building discharge pressure in the process. When the volute is cracked, eroded, or worn, this energy conversion becomes inefficient, resulting in reduced flow, poor lift performance, and increased strain on the pump motor. Replacing a damaged volute with a correct OEM part restores the pump's designed hydraulic efficiency and protects the surrounding components from accelerated wear.
Part Details
| Part Number | 5200021722 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Volute |
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.
