The DGX Moldable Mouthpiece fits all brands of regulators, except Poseidon. Just dip the mouthpiece in hot water using the supplied "handle" then briefly cool and place into your mouth in the proper orientation. Bite down softly for a perfect fit of YOUR bite pattern. Reduce jaw fatigue and increase comfort during your dives. Easy to customize and install. Included is a tie wrap to attach the mouthpiece to the second stage. Hard plastic bite tab retainers (pictured) allow for a better shape, but should be removed after molding and before diving. The mouthpiece tabs may be cut and shortened in length for smaller mouths or personal preference. The mouthpiece may be heated and reshaped but at this great price we suggest replacement over remolding.