The Wacker Neuson 5200021682 is a genuine OEM O-Ring designed for the APT4S and APT4T series self-priming pumps, including cold weather and standard configurations. As a direct factory replacement, this O-Ring meets the original sealing specifications required to maintain leak-free pump operation. It fits across multiple APT4 variants — including surge brake, electric brake, and cold weather builds — making it a versatile service part for fleets running mixed pump configurations. Keep a spare on hand to avoid extended service interruptions during seal replacement intervals.
Key Features
- OEM-Grade Sealing Material — Manufactured to the original compound and durometer spec, ensuring consistent compression and sealing performance in pump service environments.
- Drop-In Replacement — Matches the original O-Ring profile exactly, seating into the factory groove without modification or fitment adjustment.
- Broad APT4 Series Coverage — Fits APT4S and APT4T pumps across surge brake, electric brake, standard, and cold weather variants.
- Maintains Pump Integrity — A correctly seated O-Ring prevents fluid bypass and pressure loss; a degraded seal allows leaks that reduce pump output and can cause dry-run damage.
- Genuine Wacker Neuson Part — Sourced directly from Wacker Neuson, carrying the same part number (5200021682) used by authorized service technicians worldwide.
An O-Ring is a precision elastomeric seal used at joints, ports, and mating faces throughout the pump assembly to prevent fluid or air from escaping under pressure. In self-priming pump applications like the APT4S and APT4T, a correctly functioning O-Ring is critical to maintaining the vacuum needed for priming and sustaining output pressure during operation. When an O-Ring hardens, cracks, or is displaced, the resulting leak path causes pressure drop, loss of prime, and potential ingestion of air or contaminants into the pump housing.
Part Details
| Part Number | 5200021682 |
|---|---|
| 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.
