Extend the life of your CPAP mask by purchasing a new swivel or elbow. Not all mask offer an elbow to be purchased as a replacement part. Mask elbows are a 90 degree angled elbow engineered to snap to the front part of the mask to allow for connection of short tube or CPAP tubing. Most elbows feature the 360 degree swivel design allowing easy movement without the stress of being tangled.