Multiquip 0802081104 Reserve Tank Cap

The Multiquip 0802081104 Reserve Tank Cap is a genuine OEM replacement designed for DLW and DAW series diesel welder-generators, including the DLW400ES, DLW400ESA4, DLW330X2, DLW300ES, DAW500SA4, DLW500ESA4, DA7000SSA2GH, and DA7000SSA2. As a direct OEM component sourced through Multiquip's authorized parts network, it is manufactured to the exact fit and material specifications of the original cap. This is a direct-fit replacement that seats and seals the same way as the factory-installed part, requiring no adaptation. If you are servicing a DLW or DAW series unit, verifying the part number 0802081104 against your machine's parts manual ensures you receive the correct cap for your configuration.

Key Features

• Genuine OEM Sealing Material — Manufactured to the same material and dimensional spec as the original, ensuring a proper seal on the coolant reserve tank to prevent evaporation loss and contamination.
• Direct-Fit Replacement — Threaded or snap-fit to match the original reserve tank neck on DLW and DAW series units, seating exactly as the factory-installed cap without adjustment.
• Broad Series Compatibility — Confirmed fitment across DLW400ES, DLW400ESA4, DLW330X2, DLW300ES, DAW500SA4, DLW500ESA4, DA7000SSA2GH, and DA7000SSA2 models.
• Coolant System Integrity — A correctly seated reserve tank cap maintains proper pressure balance in the cooling circuit, allowing the system to draw coolant back as the engine cools and preventing air ingestion.
• Fuel and Fluid System Safety — A failed or missing reserve tank cap can allow coolant to escape or allow debris and moisture into the cooling system, risking overheating on a working generator or welder under load.

The reserve tank cap seals the coolant overflow or recovery reservoir on diesel welder-generator units, allowing the cooling system to operate as a closed loop. As the engine heats up, excess coolant expands into the reserve tank; as it cools, that coolant is drawn back into the radiator circuit. A properly functioning cap maintains the pressure differential that makes this exchange possible, keeping the cooling system topped up and stable. A cracked, missing, or ill-fitting cap breaks that loop — leading to gradual coolant loss, potential overheating, and accelerated wear on the engine during demanding welding or generation cycles.

DHS Equipment supplies genuine Multiquip OEM parts with part number verification on every order. For fitment questions or help confirming compatibility with your specific serial number, contact the DHS Equipment parts team directly.

Part Details

Compatibility & Fitment

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.