The Wacker Neuson Drain Plug is a genuine OEM component designed for the HI and HDR series indirect-fired air heaters and direct-fired radiant heaters. As a direct OEM replacement, part is manufactured to the exact material and thread specifications of the original, ensuring a secure, leak-free seal every time. This drain plug is confirmed to fit a wide range of Wacker Neuson heater models including the HI 300HD D, HI 400HD D, HI 110HD D, HI 300D, HI 110D, HI 200D, HI 200HD D, HI 35, HI 90, HI 90HD, HI 120, HI 120HD, HDR 155, HDR 115, HDR 45, HD 50, and HD 70. Verify your model number before ordering to ensure the is the correct drain plug for your unit.
Key Features
- OEM Thread and Material Match — Manufactured to the exact thread pitch and material grade of the original plug, delivering a proper fluid-tight seal without improvisation.
- Drop-In Replacement — Installs directly into the existing drain port with no reworking of the drain boss or surrounding components.
- Broad HI and HDR Series Fitment — Confirmed for HI 110HD D, HI 200D, HI 300HD D, HI 400HD D, HDR 115, HDR 155, and additional HI and HD models across multiple machine numbers.
- Maintains Fuel System Integrity — A sound drain plug keeps diesel fuel and/or heat-transfer fluid fully contained during operation, transport, and seasonal storage — preventing spills and protecting the heater's burner components.
- Fuel System Safety — A correctly seated drain plug is a frontline safeguard against unintended fuel release. Using the correct OEM plug ensures rated torque retention and eliminates the risk of thread mismatch that can cause slow leaks around diesel fuel systems.
The drain plug on a diesel-fired heater seals the low-point drain port in the fuel or fluid circuit, allowing controlled drainage during servicing, winterization, or transport while keeping the system fully sealed during operation. When the plug is damaged, cross-threaded, or missing, the heater cannot hold its working fluid, leading to fuel leaks, contamination risks, and an inoperable unit until the plug is replaced. Keeping a correct OEM drain plug in place is a straightforward maintenance step that protects both the heater and the surrounding work environment.
Part Details
| Part Number | 5000183939 |
|---|---|
| Old Part Number | 0183939 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Drain Plug |
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 |
| HI 200 D Indirect Air Heater | HI200D | 5000620865, 5200011877 |
| HI 200HD D Indirect Air Heater | HI200HDD | 5000620916, 5200011878 |
| HDR 155 Direct Fired Radiant Heater | HDR155 | 5200007530 |
| HDR 115 Direct Fired Radiant Heater | HDR115 | 5100018592 |
| HDR 45 | HDR45 | 5200013800 |
| HD 50 | HD50 | 5200019335 |
| HD 70 | HD70 | 5200019336 |
| HI35 | HI35 | 5200019337 |
| 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.
