NEJE 40W – A40640 - Air Assist Cutting & Engraving module.   
Includes Push-fit 4/6/8mm hose connector.  (Please ensure you support the accessory when inserting)
Includes O-ring which secures the lens from vibrating loose once set.  Doubles up as airtight seal to stop wasting air blowing past lens.  Particularly important if you are using lower volume\pressure aquarium type air pumps
Includes spacer guide for optimum cutting performance.  These settings dramatically increase cutting performance vs factory wound in setting.  Turn the spacer around an get height suggestion for optimum bottom -> up distance to machine surface or top -> down distance (This assumes 2-4mm material thickness and is a guide only, please refine accordingly)
Select your necessary accessories 
We recommend using one of the Hailea Piston Air Pump illustrated for example only.  60L + versions work consistently well.  
Material is PLA and is designed to retain form over time. 

Please note this can be purchased as a Kit from drop down box which would include the following:
- 3D printed Air Assist nozzle
- Pushfit 6mm connector
- 6mm tubing - 2 metre
- Spacer guide
- O-ring
- Air tap