This O-ring pack supplies the sealing rings used around the axle mounts of gear differentials in drift setups, preventing oil escape on RC models. The 4 pcs are intended as direct replacements when seals have become worn or during regular setup changes.
The rings secure the axle/differential interface to retain differential oil and preserve the lubrication required for steady differential response while drifting. Fitting is normally done during routine service when the differential carrier is accessible.
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