If 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.
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