A PCO 28 compatible PET bottle cap for pneumatic fittings. Supported Fittings/Holes: I recommend printing the cap at 0.1mm layer height, with at least 50% infill. If you don't have a suitable gasket, you can cut your own with the provided gasket cutting tool. Just print two "GasketTool.stl", put a piece of rubber in between (after poking/cutting a hole in it), fix all with a 3mm screw/nut and carefully cut it down to size. Protip: Old bicycle tubes will also work fine ;-) Depending on the fittings and the gasket, it might be required to additionally apply some teflon tape (thread seal tape) to the threads of the fittings and the bottle. A rotating gasket can be fixed with a drop of glue. Distance of the cap's mounting holes is 40mm.