The O2 Procedural Clip is an accessory to the Curve that lets medical workers wear an extra layer of protection. They can switch their disposable masks between patients while staying protected all day. We designed the clip to have circular bumps, so procedural masks can grip onto the attachment without sliding off. The clip connects to the Curve using four mounting pins. These pins are tall enough so that the respirator's air flow remains unchanged. The clip is 3D-printed using polycarbonate.