A replacement cushion for the Philips Respironics Full Face CPAP interface. All CPAP interfaces are final sale due to hygienic reasons. CPAP interfaces are FDA approved medical accessories for personal use, therefore, we do not accept returns of any opened products. If you are unsure of a size, please contact us. If the interface is defective, decision for repair or replacement is made solely by the manufacturer under the manufacturer’s warranty period. Visit ourTerms and Conditions page for more information.