The Wacker Neuson 5200020151 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming trash pumps. Sourced directly from Wacker Neuson, this seal is manufactured to the exact material grade and compression tolerances required for reliable pump operation across the full APT4 pump lineup — including standard, electric brake, surge brake, and cold weather configurations. Whether you're servicing an APT4S Pump with Skid or an APT4T Pump with Electric Brake, part number 5200020151 is the correct OEM replacement to restore your pump's sealing integrity.
Key Features
- OEM-Grade Seal Material — Manufactured to the exact compound and durometer specification required for APT4 pump sealing surfaces, ensuring full compression and zero fluid bypass.
- Drop-In Installation — Molded to the correct cross-section and diameter for direct seating into the APT4S and APT4T pump housing — no trimming or adaptation needed.
- Broad APT4 Series Coverage — Fits APT4S and APT4T variants including standard, surge brake, electric brake, and cold weather configurations.
- Maintains Pump Prime and Discharge Performance — A degraded O-Ring allows air ingestion or fluid leakage at sealing joints, causing loss of prime and reduced discharge pressure; this genuine replacement restores full sealing performance.
- Genuine Wacker Neuson OEM Part — Supplied as part of Wacker Neuson's authorized service parts program, carrying the full confidence of OEM sourcing for critical pump sealing components.
An O-Ring is a precision-molded elastomeric seal used at mating surfaces and joints within the pump assembly to prevent fluid or air from escaping between components. In a self-priming trash pump like the APT4S and APT4T, maintaining an airtight seal at these joints is essential — any breach allows air to enter the suction path or fluid to leak from pressurized connections, both of which directly compromise the pump's ability to prime and sustain flow. When an O-Ring flattens, cracks, or takes a permanent set from heat and chemical exposure, it loses its sealing force and must be replaced promptly to avoid operational loss and potential damage to surrounding components.
Part Details
| Part Number | 5200020151 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
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.
