Regulator
  

You cannot breathe directly out of a scuba tank because of the high pressure. A regulator reduces pressure to safe a level that can be inhaled by the diver. A diving regulator has two parts: the First Stage reduces the tank pressure and connects it to the Second Stage which contains the mouthpiece for breathing

Scubapro MK21/G260 Regulator - Yoke

$613.00

Island Divers
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GOING ABOVE AND BEYOND This combo offers outstanding breathing performance, plus it's loaded with features that enhance cold-water diving. The MK21/G260 is a high performance reg system on steroids. It may be positioned in the mid-range of SCUBAPRO's regulator lineup, but it behaves like a front-runner with its ability to handle any diving scenario with power to spare. The MK21 is SCUBAPRO's most compact balanced-piston first stage. Smaller and lighter than the MK25, it 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 G260 is the most imitated air balanced second stage design of all time. First introduced in 1986 as the G250, it was the first regulator to introduce an adjustable Venturi Initiated Vacuum Assist (VIVA). Today's modern version features metal components (inlet tube, orifice, inhalation control knob and hose connector) for excellent cold-water performance. It also offers a left-right hose attachment option, making it a great choice for tech diving configurations. When you put them together you get a super-charged breathing system that's surprisingly affordable. It's a proven performer for all types of diving, but where the MK21/G260 really excels is in cold-water diving scenarios and technical applications.

Air-balanced flow-through piston provides constant and effortless airflow unaffected by depth, tank pressure, or breathing rate.
Unique thermal exchange design with external fins optimizes freezing resistance.
Two high pressure ports, one on each side of the body, allows the first stage to be positioned either up or down.
Standard "smart" hose routing cap offers four low pressure ports.
Optional hose routing cap increases routing configurations with four angled low pressure ports.
Redesigned yoke allows for easier mounting on a cylinder, and redesigned cap.
Nylon fiberglass design features SCUBAPRO's largest second stage casing and diaphragm.
Anodized aluminum front cover ring adds resistance without adding weight.
High-flow exhaust valve reduces exhalation for better overall breathing comfort.
Air-balanced valve smoothes out the inhalation effort when diving at varying depths and supply pressures.
A diver-adjustable inhalation effort knob fine-tunes air delivery to suit changing depths, water conditions and personal tastes.
Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch

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