This is a system for a basic sandblasting apparatus that connects to an air compressor. The tube section is designed to take 1/2 inch copper tubing, and i would advise to crimp the end of the tube to make a nozzle type feature. If you want to scale down the designs you would need to adjust the scaling of the connector on the top of the lid.  I also printed mine in nylon, so it is more resistant to the abrasion from the sand.