This is the #44 shield ring for the DLE 222 twin, a large-displacement two-stroke petrol twin for very large scale models.
The part itself is a sealing O-ring used at a joint on the engine.
Why it is replaced: rubber hardens with heat and stops sealing, so O-rings are renewed rather than reused.
Fitting note: Confirm the correct size and material for the location before fitting.
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