Retaining Clip Piston C-Form 16mm Vespa PX, Cosa

Piston clip for the pistons of Vespa PX 200 and cylinder kits.
There are two different shapes, square and round.

1. The original Piaggio cylinder kit has a square-milled locking groove.
2. Tuning cylinders from DR, Polini, Olympia, Malossi, etc. usually have a round cutout.