The Wacker Neuson Coupling is a genuine OEM component designed for a broad range of Wacker Neuson indirect air heaters and direct fired radiant heaters, including the HI 90, HI 120, HI 200D, HI 300D, HI 400HD D, HDR 115, HDR 155, and related HD series models. As a factory-sourced part, it is manufactured to the same specifications as the original, ensuring consistent performance across the full range of compatible heater models. Whether you are servicing an HI 110HD D, an HI 300HD D, or any of the HDR and HD series units, part number is the correct coupling for the job. Cross-reference your model number before ordering to confirm fitment.
Key Features
- Genuine OEM Coupling Integrity — Manufactured by Wacker Neuson to original tolerances, maintaining the precise engagement and sealing characteristics a coupling in this fuel or fluid circuit demands.
- Direct-Fit Installation — Connects using the same interface as the original, allowing a straightforward swap without reworking adjacent fittings or lines.
- Wide Heater Series Coverage — Compatible with HI 90, HI 110D, HI 120, HI 200D, HI 300D, HI 400HD D, HDR 45, HDR 115, HDR 155, HD 50, HD 70, and additional HI HD series indirect and direct fired heaters.
- Sustained Fuel Flow Performance — A correctly functioning coupling maintains leak-free fuel delivery to the burner assembly, supporting consistent heat output and reliable ignition cycles in cold-weather operation.
- Fuel System Safety — Replacing a cracked or failing coupling with a genuine OEM part eliminates the risk of fuel leaks in diesel heating equipment, where an uncontrolled leak presents a serious fire and safety hazard.
A coupling in a diesel-fired heater serves as a sealed connection point within the fuel delivery circuit, joining fuel lines, pump outlets, or burner components so that diesel can flow under pressure without leaking. When the coupling is in good condition, it holds a consistent seal through repeated heat and pressure cycles. A worn, cracked, or deteriorated coupling can allow fuel to weep or spray at the joint, disrupting burner operation, causing inconsistent heat output, and creating a potential fire risk — making timely replacement essential for safe, effective heating on the jobsite.
Part Details
| Part Number | 5200011788 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Coupling |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI 300HD D Indirect Air Heater, Diesel | HI300HDD | 5000620867 |
| HI 400HD D Indirect Air Heater | HI400HDD | 5000620868 |
| HI 110HD D Indirect Air Heater, Diesel | HI110HD D | 5000620864 |
| HI 300D, HEATER-INDIRECT, DIESEL, -20° | HI300D | 5000620866 |
| HI 110D, HEATER-INDIRECT, DIESEL, -20° | HI110D | 5000620915 |
| HDR 155 Direct Fired Radiant Heater | HDR155 | 5200007530 |
| HI 200D Indirect Air Heater | HI200D | 5200011877 |
| HI 200HD D Indirect Air Heater, Diesel | HI200HDD | 5200011878 |
| HDR 115 Direct Fired Radiant Heater | HDR115 | 5100018592 |
| HDR 45 | HDR45 | 5200013800 |
| HD 50 | HD50 | 5200019335 |
| HD 70 | HD70 | 5200019336 |
| HI 90 | HI90 | 5200019340 |
| HI 90HD | HI90HD | 5200019341 |
| HI 120 | HI120 | 5200019342 |
| HI 120HD | HI120HD | 5200019343 |
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.
