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If you've got a Dexter Fortress axle in the 5,200 to 8,000 lb range, this is the correct oil fill plug.

It's a threaded aluminum cap, part number K21-303-00.
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Simple, direct replacement from Southwest Wheel.

It's brand new, in the original packaging.
Just screws in to seal your axle fluid.

No need to hunt for the right one—this is the factory-style cap.
Keep that axle oil where it belongs.

Small part, but essential.

4.3 out of 5