This is the #14.5 ptfe tube for the DLE 20RA single, a small-displacement two-stroke petrol engine for sport-scale models.
The part itself is PTFE pipe for the fuel or pressure plumbing.
Why it is replaced: replaced when the pipe cracks or the ends deform and stop sealing.
Fitting note: Check the fittings for damage and support the pipe against vibration.
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