Here is a set of 2 air assist for the Atomstack A5 laser module. It use a 3d printer nozzle to precisely direct the airflow. Its direct fit to the original red shield provided with the module. There is one model to tight fit a 1/4 hose and another one to screw a quick connect fitting. You must tap the inside of the nozzle hole and if using the quick connect model, also tap the hole for the fitting. Use a m6 tap for the nozzle and a M10 tap for the fitting, or wathever your choice of fitting needs. The hole for the fitting is actually 9.8mm. if you need another dimension, just let me know.