Radiator Drain Plugs — Find the Right Part

Radiator Supply House stocks drain plugs and petcocks for a wide range of heavy equipment including Caterpillar, Komatsu, John Deere, Daewoo, MTU, Peterbilt, and Freightliner models. Applications span construction equipment, commercial trucks, generator sets, mining machinery, and industrial equipment operating in standard and high-temperature environments.

To find the correct drain plug, you need your equipment make, model, and serial number. Thread size, plug diameter, and material (brass or plastic) are key specifications. Contact Radiator Supply House via phone or chat with your equipment details and our specialists will help identify the correct replacement part for your cooling system.

Yes, replacing a radiator drain plug is a straightforward maintenance task. Ensure the coolant is fully drained and the engine is cool before removal. Use the correct thread size and torque specification to avoid cross-threading or leaks. Using OEM-equivalent replacement plugs, like those supplied by Radiator Supply House, ensures a proper seal and long-term reliability.

A drain plug is a solid threaded fastener that must be fully removed to drain coolant. A petcock is a small valve with a turn mechanism that allows controlled draining without full removal. Both serve the same purpose on radiators, but petcocks offer more convenience for routine coolant flushes on heavy equipment and commercial trucks.

Signs of a leaking drain plug include visible coolant puddles under the equipment, a drop in coolant reservoir levels, white residue or mineral deposits near the plug, and engine overheating. Inspect the plug and surrounding area regularly. A worn thread, cracked plug body, or missing sealing washer are common causes that require immediate replacement.

Not always. Thread pitch, diameter, and plug length vary by radiator manufacturer and equipment model. While some thread sizes are standardized, using an incorrect plug risks leaks or thread damage. Always match the replacement drain plug to your specific radiator model. Radiator Supply House provides application-specific parts matched to your equipment make and model.