The tubing is silicon 7 feet with cannula. The following things are "free" along with purchase of the tubing.
- Invacare 5 concentrator works for concentrating O2 from room air I have been using to make ozone with an ozone generator and also exercising with supplemental O2. If you want to use it for medical/breathing purposes, I recommend getting it serviced first since I cannot certify. There is a service center in prescott res-az dot com
- Empty cylinder with regulator that you can turn in/swap for a filled O2 tank, the certification date has passed on the tank so it would need to be traded in for a new tank, but this saves you from the initial purchase of a tank which is approximately $100.
Must take all 3 (yes there is a reason I am listing this as tubing for $30 and the other things as free).