Compressor Air Gun TPU piston Cover

This is an accordion TPU cover to cover the piston on an compressor air gun I am putting into a blast cabinet with the goal to keep keep some of the media out.

The shaft is 6mm dia x 12.7mm long. The nut is 15.4mm diameter with a height thickness of 3.4mm.

Most of the tension is on the NUT as we need the shaft to float freely without binding. No lubricant to help the shaft slide as that cannot be used in a dry blast cabinet. Seams to work ok.