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A lock nut for D25RE2 injectors from Dosatron. This lock nut is a trusted factory part. It is made with the same material as the original.
When the lock nut on your D25RE2 injector cracks or begins to leak it is time to replace it. Swap it out with Dostron P168. Since this is a genuine OEM part, it is sure to fit the injector model recommended by the manufacturer.