The MK21 S560 combines proven and new technologies that expand the regulator’s range and give divers performance in any environment. The first stage uses a balanced piston design enclosed in a new compact case. External fins improve heat exchange in cold water, and divers can choose between a standard or optional cap. The standard cap has four low-pressure ports at 20 degrees. The optional cap includes a fifth low-pressure port and hose orientations of zero and 30 degrees, which can be better for technical diving. The mid-size S560 second stage includes both a dive/pre-dive switch to manage free flow and an adjustment for inhalation resistance. The Bottom Line: The MK21 S560’s new first stage and compact design gives divers practical performance without breaking the bank.

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