The DreamWear Silicone Diametric Pillow Cushion by Philips Respironics is a specialized all-silicone nasal pillows cushion for the DreamWear mask. Available in various sizes, it offers a comfortable and leak-resistant fit. To purchase, visit CPAP equipment retailers like MyCPAP, CPAP.com, or Amazon, ensuring you select the correct size. Follow manufacturer's instructions for proper setup to ensure effective CPAP therapy. For precise usage guidance, consult the user manual or contact the manufacturer.