IThere are 5 simple step that if you follow you will possibly be able to sell your hyperbaric chamber.  

1. Call Professional Certified Reseller / Broker: This is an important call because the certified broker can gage if the chamber is sellable.  Keep in mind that there are several factors that can influence if the chamber can be sold and at what price.  
2. Get Inspection: This will fall on the broker, certified dealer or manufacture. Need to be done to insure safe medical device for resale.
3. Take Photos and videos: Take photos or videos and send them to me before shipping. This will help give me a general condition of the chamber.  
4. Provide Copies of Sale Documents: It is wise to keep and ship all sales documents and if possible Original Boxes.
5. Sign an Agreement: Make 3 copies, fill in all the blanks, place 2 in the boxes and keep one for your records.  Make sure to add serial number and all parts.  
6. Clean The Chamber: Vacuum the inside and use soap and water to wipe down the chamber and components.  
7. Pack / ship:  Pack in original boxes but if not you can buy boxes on U-line.  Do not pack using popcorn foam you can use Styrofoam blocks and bubble wrap.  You can ship with UPS or Fed Ex