There are several items that are essential when putting together a Save-A-Dive Kit, Cylinder Valve O-rings, Fin Straps, Buckles, etc. One of the most important items is the spare Regulator Mouthpiece. This Hollis Black Silicone Mouthpiece is a Patented Orthodontic Mouthpiece for comfort and reduced jaw fatigue. Universal and will fit a large variety of Regulators out there. Mouthpiece is Soft and Comfortable. Don't let a bad mouthpiece be the cause of a leaking regulator always carries a spare. Oh Yea! Don't forget the Tie Wraps to attach it with! SEE: SKU AQUTW10 Tie Wrap.