The Multiquip D4312501003 Radiator Lower Hose is a genuine OEM component designed for the DLW400ES series diesel light welder. As a direct OEM replacement, D4312501003 is manufactured to the exact dimensions and material specifications of the original part, ensuring a correct connection between the radiator and the engine cooling circuit. This hose is confirmed for DLW400ES, DLW400ESA, and DLW400ESA1 machines, making it a straightforward, no-guesswork replacement for field service or scheduled maintenance.
Key Features
- Genuine OEM Construction — Produced to the same material and dimensional tolerances as the original, maintaining proper coolant flow pressure and heat resistance across the full operating range of the DLW400ES.
- Exact Hose Routing and End Fit — Molded to match the original lower hose path, so it seats correctly onto the radiator and engine inlet without trimming or adapter fittings.
- Confirmed Fitment — Verified for DLW400ES, DLW400ESA, and DLW400ESA1 diesel light welder models.
- Coolant System Integrity — A correctly seated lower hose sustains consistent coolant circulation, protecting the engine from heat buildup during extended welding operations or high-load generator output.
- Fuel and Heat-Resistant Compound — The hose material is rated to withstand the thermal cycling typical of diesel-powered equipment, resisting softening, cracking, and coolant weeping at the clamp seats.
The radiator lower hose carries coolant from the bottom of the radiator back to the engine water pump, completing the closed-loop cooling circuit that keeps the diesel engine at a safe operating temperature. Over time, heat cycling and engine vibration cause the hose material to harden, crack, or collapse internally, restricting flow and leading to overheating — which on a diesel light welder like the DLW400ES can mean unexpected shutdown during active welding or power generation. Replacing a worn lower hose with the correct OEM part, D4312501003, restores full coolant circulation and prevents heat-related engine damage.
Part Details
| Part Number | D4312501003 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Radiator Lower Hose |
Compatibility & Fitment
| Name | Model |
|---|---|
| Welders | DLW400ES |
| Welders | DLW400ESA |
| Welders | DLW400ESA1 |
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.
