Abstract: A mouthpiece polymer body comprising a distal side and a proximal side. The distal side further having a fastener element, and where the fastener element is integrated into the mouthpiece polymer body. A mouthpiece comprising at least one fastener element and a polymer body, where the fastener element is integrated as part of the polymer body. A method to demountably attach/detach a mouthpiece to a regulator comprising using the proximal side of a mouthpiece to create a mechanical advantage to open the distal side of the mouthpiece using a fulcrum. Also using the mouthpiece polymer to provide the elastic force to lock said mouthpiece onto the regulator.