The SCUBAPRO MK21/S560 is more than an Excellent Mid-Range System. This combination offers High Performance, Reliable SCUBAPRO Technology and Value. The SCUBAPRO MK21 is a new Compact-Sized Piston-Controlled First Stage. Close to 20%-Smaller than SCUBAPRO's MK25, MK21 is a Mid-Range Air Balanced, First Stage. Air Balanced Pistons deliver Significantly-More Air to the Second Stage than any other First Stage, while their performance is totally unaffected by the changing tank pressure. A Balanced Piston allows the use of Lighter-and-More-Sensitive Components, resulting in Ultra-Fast Breathing Response, instant delivery of air on demand, and extra high air flow, especially in low tank pressure ranges. The tired diver benefits from a smoother breathing regulator during the ascent or deco stop. Balanced Piston First Stages are the first choice of demanding sport divers and professionals. A Balanced Piston performs equally in warm and cold water environments.
The MK21 First Stage offers the best compromise for the right price and the right performance with Ease-of-Maintenance. Cold Water Diving with SCUBAPRO-Diving conditions can be drastically different, including extreme cold water and outside temperatures, posing the possibility of a regulator "freezing". Therefore, Resistance-to-Freezing is Imperative for the diver. All SCUBAPRO Regulator Systems are CE Approved for 3336psi (230 bars) Cold Water Diving. Some models go even beyond this Super-Stringent-Qualification and have successfully been Tested-in-Extreme-Cold-Diving-Conditions at less than 3.9°F (3.9°C). As a Specific-Anti-Freezing-Measure, SCUBAPRO engineers have designed a Patented Finned Cap for the MK21 First Stages for Optimal-Cold-Water-Diving. This Finned Cap is a Thermal Insulating System (TIS).The Ribs of the TIS Act-as-a-Radiator to Increase the Surface-Area of Heat-Transfer from the Water to Warm-Up the Internal-Parts that have been Drastically-Cooled-Down by the Gas-Pressure-Drop.
The MK21 is manufactured from Marine-Grade Chrome Plated Brass, has a Balanced Composite/Stainless Steel Flow-Thru Piston and with the Standard Head it has 4-HF (High Flow) Low Pressure (LP) Ports with Hose Routing at +/- 20° Degree Angles and 2 High Pressure (HP) Ports, one on each side of the body. The MK21 First Stage has an externally adjustable intermediate pressure which allows authorized SCUBAPRO service technicians to quickly fine-tune and adjusts the first stage after maintenance without the need to disassemble it.
The SCUBAPRO S560 Second Stage Regulator is a Lightweight, Techno-Polymer Barrel Second Stage with a Rugged, Precision Molded Carbon Fiber and Techno-Polymer Case. The S560 is Air Balanced with Diver Adjustable Inhalation Effort and Venturi Initiated Vacuum Assist (VIVA). The S560 has a Diver Adjustable Inhalation Control that enables personal Adjustment of Breathing Effort. The S560's Diver Adjustable (VIVA) Dive/Pre-Dive Control Switch and Extra High Flow Exhaust Valve account for Easy Inhalation & Exhalation at any Depth or Breathing Rate. The Regulator comes equipped with a 3/8" Threaded Super-Flow Hose with Strong and Durable Kevlar Lining and a Super-Comfort High-Flow (HF) Mouthpiece for Smooth Air Delivery. The Regulator weighs 32.2oz (916g), comes with an Owner's Manual and a Limited Lifetime Warranty.
This product has a limited lifetime warranty.