The Wacker Neuson 5100040901 Gasket is a genuine OEM gasket designed for the APT4T and APT4S series self-priming centrifugal pumps. As a direct factory replacement, this gasket ensures a proper seal between mating surfaces — preserving pump integrity across standard and cold weather configurations. Wacker Neuson genuine OEM parts are manufactured to the same specifications as the originals installed on the production line, so you can trust the 5100040901 to fit and function exactly as intended. Compatible fitment includes the APT4T Pump with Electric Brake, APT4T Pump with Surge Brake, APT4S Pump with Skid, and the cold weather variants of each.
Key Features
- Genuine OEM Sealing Integrity — Manufactured to the exact material grade and compression profile specified for APT4T and APT4S pump assemblies, ensuring a leak-free interface between mating surfaces.
- Drop-In Replacement — Matches the original gasket profile exactly, seating correctly between pump components without trimming or shimming.
- Broad APT Series Coverage — Fits the full APT4T and APT4S lineup, including Electric Brake, Surge Brake, Skid-mounted, and Cold Weather variants.
- Maintains Pump Output and Prime — A failed or degraded gasket allows pressure loss and fluid bypass; replacing it with the correct OEM part restores full pumping efficiency and stable prime.
- Fuel and Fluid System Compliance — Using the correct OEM gasket material is essential in pump applications where fluid containment is critical to safe and compliant operation.
A gasket creates a static seal between two joined pump components, preventing fluid from escaping the pressurized flow path. In a self-priming centrifugal pump like the APT4T or APT4S, maintaining that seal is essential for building and holding prime — without it, the pump loses suction capability and output pressure drops. When a gasket deteriorates, cracks, or is compressed unevenly, it allows fluid to bypass or leak at the joint, which can cause the pump to lose prime entirely and lead to accelerated wear on surrounding components.
Part Details
| Part Number | 5100040901 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Gasket |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4T Pump, Electric Brake | APT4T | 5200019644, 5200019643 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
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.
