ResMed Interface Elbow for Mirage SoftGel, Mirage Activa LT and Mirage Micro Nasal Interfaces. This interface elbow is a replacement part designed to fit a variety of the Mirage CPAP interfaces from ResMed. The interface elbow works in-conjunction with the tube and the interface to provide proper air flow from your CPAP device to you. Key Features. Easy to attach. Durable Design. Reviewers Tip. This elbow replacement is designed to fit with a variety of Mirage CPAP Interfaces. Specifically the elbow replacement will work for the Mirage SoftGel, Mirage Active LT, and Mirage Micro Nasal In...