WL21-15-203 radiator drain plug for Mazda 6, CX-7 and CX-9

Radiator drain plug, reference WL21-15-203

This replacement plug closes the matching coolant drain opening in a Mazda radiator. It is listed against reference WL21-15-203, also written as WL2115203, for selected Mazda 6, CX-7 and CX-9 applications.

The pictured part is one black plug with a raised hex head, a round flange and an externally threaded stem. Compare the original plug and radiator port before ordering, especially if the radiator has been replaced.

Plug and application details

Replacement reference

WL21-15-203 / WL2115203

Listed models

Selected Mazda 6, CX-7 and CX-9 applications; confirm by VIN and radiator reference

Service location

Radiator coolant drain opening

Quantity supplied

One drain plug

Head and flange

Raised hex head above a round flange

Stem

External thread with a narrower tip, as pictured

Match the plug to the installed radiator

Check the part reference in the vehicle's cooling-system diagram, then compare the thread, stem length and sealing arrangement with the plug being replaced. Model names alone do not establish compatibility with every year, engine or replacement radiator.

Thread diameter and pitch, hex size and installation torque are not specified for this item. Confirm the required seal separately; a loose replacement gasket or O-ring is not listed in the pictured supply.

Check the drain opening during service

Inspect the radiator's drain port and sealing surface for damage before fitting a new plug. Replacing the plug will not repair a damaged radiator tank or stripped port. Use the vehicle's service procedure for cooling-system pressure release, coolant collection, refill and leak checks.

The radiator and coolant are separate items. The WL21-15-203 reference is used for replacement identification and does not indicate Mazda manufacture.