Resmed Disposable S9 CPAP Filter,2-1/4" x 1-3/8",2/Pack,CF2107-2Price: USD1.99 Resmed Disposable S9 CPAP Filter is an essential component of the CPAP machine. It collect dust, pollen, mites and other components that would otherwise make it into your lungs and disrupt sleep. Made of polyester fiber.Other products from H e a l t h P r o d u c t s F o r Y o u |