Thank you for contacting CPAP SUPPLY USA.
The fact that you have a Devilbiss 9000 leads me to think that you have an older CPAP. Many people are unfamiliar with this CPAP. Have you considered getting a new CPAP? Most insurances allow you to have a new CPAP every 5 years. You may want to consider a new CPAP.
We can help you purchase one out of pocket or can also check for you to see if your insurance will allow you to have a new one. If you send us the prescription we can set your CPAP to what your doctor recommended.
You may want to call Devilbiss directly to see if they will tell you how to change the pressure. The number for Devilbiss is 800-338.1988.
Please let us know if we can be of further help.
Debbie Shirley,RRT