Apeks – ATX Octopus

Lightweight and compact, this versatile breather offers superb performance and value – plus a whole lot more.

The compact and lightweight MK21/S560 is a full-featured reg combo that’s easy to use, offers SCUBAPRO reliability and is priced right, making it the ideal mid-range system for a variety of diving scenarios.

The MK21 is SCUBAPRO’s first balanced-piston first stage to be released since the introduction of the MK25. It is smaller and lighter than the MK25 and uses a smaller piston, but it delivers the same level of breathing performance, no matter how hard you’re breathing, how deep you’re diving or what your pressure gauge reads. The MK21 also provides exceptional resistance to freezing due to the thermal exchange produced by the external fins on its polished chrome brass body. The MK21’s innovative “smart” hose layout comes with a standard cap with four low pressure ports angled (+/- 20º) to maximize hose routing. This standard cap can be replaced with an optional cap that offers four low pressure ports at more extreme angles (0°/30°) plus a fifth centralized high-flow low pressure port — a useful configuration for technical diving.

The air balanced S560 second stage features a lightweight techno-polymer casing and comes with full user controls, including an inhalation effort adjustment knob and a Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch. It can be counted on to breathe dry and easy, regardless of depth or your position in the water.

The MK21/S560’s size and weight make it an excellent choice for travel divers, its innovative fin design makes it a good cold-water performer, its “smart” hose layout is well-suited for some technical applications, and its overall ease of use, reliability and price make it the must-have reg system for recreational divers of all skill levels.