Thank you for cotacting CPAP SUPPLY USA.COM
It is possible to use nasal pillows at higher pressures, but I would consider using the Resmed Liberty or the Hybrid. This gives you the option of using nasal pillows but also the benefit of a full face mask, allowing you to breathe through your mouth as well. With the other types of nasal pillows the pressure will be delivered directly into your nostrils, which at 15 will probably be very uncomfortable.
Please check our website, www.cpapsupplyusa.com for the Hybrid and the Liberty . PLease feel free to call usif you have more questions.
Debbie Shirley,RRT