M20 thread cap
thingiverse
A Cap to Conceal M20 Threads, Just Like My Example For a Pressure Gauge.
Download Model from thingiverse
With this file you will be able to print M20 thread cap with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on M20 thread cap.