This is the Atomic Aquatics M1 Color Kits for Scuba Diving Regulators Features: Includes Purge Cover Adjustment Knob and Exhaust Deflector Color choices for the M1: Yellow or Gray Do you like your gear to match? If so, Atomic Aquatics has a line of Color Kits to do so. You will be able to color coordinate your gear so not only will you have some of the finest equipment available, you'll look great too!