Bose A20 Cannula

A quick connect oxygen cannula boom for the Bose A20 headset. This will easily and quickly connects to the headset microphone boom arm allowing the user to easily remove when oxygen is not required. The tube arm is ball mounted allowing for full range of motion for quick adjustments to get the cannula in the correct and comfortable position.

This was designed for use with this boom-cannula refill, but an alternate base/attachment:
https://www.aircraftspruce.com/pages/fb/oxygen_aithre/aithreboomcannularefill_13-24377.php
https://aithreaviation.com/products/aithre-boom-cannula-longer-arm-refill

Arm hole is sized for the white rubber/silicone tubing supplied in the refill kit; dish soap is useful to feed it through as the fit is intentionally tight for friction. Make sure the white tubing is pulled clear through the arm and then insert the flexible arm tubing. It helps to put a small bend in the flexible tubing to get it go around the bend and come out the other side (inside the white