SCUBAPRO MK21/S560 Regulator

SKU: SCPM21S56 MFR: 12.974.000

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Scubapro : Picture 1 regular $539.00

About SCUBAPRO MK21/S560 Regulator

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.

Warranty Information

This product has a limited lifetime warranty.
(800) 468-2822

SCUBAPRO MK21/S560 Regulator Features

  • Excellent Mid-Range System
  • High Performance, Reliable SCUBAPRO Technology and Value
  • Weight: 32.2oz (916g)
  • Owner's Manual
  • Limited Lifetime Warranty
  • First-Stage: SCUBAPRO MK21 Regulator
  • New Compact-Sized Piston-Controlled First Stage
  • Close to 20% Smaller than SCUBAPRO's MK25, Great for Travel
  • Mid-Range Air Balanced, Flow-Thru-Piston-First Stage
  • Ultra-Fast Breathing Response
  • MK21 First Stage: Best Compromise for Right-Price and Right-Performance with Ease-of-Maintenance
  • Machined, Marine-Grade Chrome Plated Body
  • Balanced Composite/Stainless Steel Flow-Thru Piston
  • Thermal Insulating System (TIS)
  • High Performance in Warm and Cold Water to 3336 psi (230 bars)
  • HP Ports: 2
  • 4-HF (High Flow) LP Ports with Hose Routing at +/- 20° Degree Angles
  • Second-Stage: SCUBAPRO S560 Regulator
  • Lightweight, Techno-Polymer Valve Barrel
  • Rugged, Precision Molded Carbon Fiber and Techno-Polymer Case
  • Air Balanced Design
  • Diver Adjustable Inhalation Effort: Personal Adjustment of Breathing Effort
  • Venturi Initiated Vacuum Assist (VIVA)
  • VIVA: Dive/Pre-Dive Control Switch: Helps Prevent Free-Flow
  • Extra High Flow Exhaust Valve
  • Easy Inhalation & Exhalation at Any-Depth or Breathing Rate
  • 3/8" Threaded Super-Flow Hose with Strong and Durable Kevlar Lining
  • Super-Comfort High-Flow (HF) Mouthpiece for Smooth Air Delivery

SCUBAPRO MK21/S560 Regulator Specifications

1'St Stage Type
Balanced Flow-Thru-Piston
Lp Ports
Hp Ports
Adjustable 2'Nd Stage
Yes, Adjustable Inhalation Effort And Venturi Initiated Vacuum Assist (Viva)
2'Nd Stage Type
Air-Balancing Valve
First-Stage: Chrome Plated Brass, Second-Stage Valve Housing: Techno-Polymer, Case: Molded Carbon Fiber And Techno-Polymer
Hose Thread
Total Weight
32.2Oz (916G)
Weight [with packaging]
3.6 lb
Mfr #

Questions & Answers Powered by TurnTo®

Questions about this item:

Kasia W  This set will include one LP hose only.
J B  I need to replace my second stage - it leaks and is 20+ years old. I'm wondering (as I don't purchase equipment often) if I can attach a newer second stage to my existing (older) first stage. Does it need to be the same brand? The brand of my old reg is no longer in existence - Dacor. I'd like to save a bit of $$ since my husband is getting certified, so we need to put more into his equipment and training right now. Suggestions?? Should I bite the bullet and just get a new 1st & 2nd? Can I still use my existing octopus and gauges with a new 1st stage? Thanks :)
KEVIN F  You can attach a second stage to your existing first stage. We currently sell 15 different second stages without first stages. However, since your current setup is no longer being manufactured, and it is recommended you get it serviced regularly, you may want to choose from some of our very affordable options of regulator sets. You can get a set (1st stage, 2nd stage, alternate 2nd stage) for as little as $230. Please email us at or call 800-637-6880 for help in choosing what options best fit your needs.
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