Respironics Wisp Nasal CPAP Mask Full Face CPAP Masks the two products are not

the two products are not interchangeable

one replacement check valve

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APEX XT Auto CPAP Machine

Respironics Wisp Nasal CPAP Mask Full Face CPAP Masks the two products are notSoft Nasal CPAP Mask The Respironics Wisp Nasal CPAP Mask offers you a comfortable and secure fit for your sleep apnea therapy needs. Designed to attach easily to your face, the headgear can be worn loosely without sacrificing performance. Best of all, the Wisp doesn't have a forehead attachment, so if you like reading or watching television before you go to bed, this is the mask for you. Multi size Cushion Design The Wisp CPAP Mask's cushion is small