A cap for "Joker system" 25mm tubes

"Joker system" is a simple and magnificent system for furnishing stores. It consists of steel round tube sections, connectors, clamps and joints.

This is a cap to close a 25mm round tube end used as a leg for a banner frame. I made it to fit a tube rather tight so it is hard to take it off by hands. I guess it can be X-Y scaled to increase inner diameter by 0.2mm for a loose fit.

Cap wall size (thickness) is 5mm which is enough to compensate the thickness of the L-joint.