Scubapro MK17 EVO/G260 Dive Regulator INT with Mouthpiece & Hose ProtectorIf you dive deep, dive cold, or often find yourself on silty bottoms or in less than pristine waters, the MK17 G260 is the reg system for you. The MK17 is a high performance, balanced diaphragm first stage engineered specifically for cold water and harsh environments. Completely sealed off from the elements, neither water nor pollution can get inside the chrome plated marine grade brass body to foul the inner mechanism. This total sealing system also