Scubapro MK25/A700 Regulator Instruction Manual

1. Introduction

This manual provides essential information for the proper use, setup, operation, and maintenance of your Scubapro MK25/A700 Regulator. Designed for demanding and professional sports divers, this high-performance regulator ensures reliable air delivery and exceptional breathing comfort in various underwater conditions. Please read this manual thoroughly before using the product to ensure safety and optimal performance.

Figure 1: Scubapro MK25/A700 Regulator. This image displays the complete regulator system, featuring the first stage (MK25) and the second stage (A700) components. The first stage, visible on the left, connects to the air tank, while the second stage, on the right, is the part the diver breathes from.

2. Key Features

The Scubapro MK25/A700 Regulator is engineered with advanced technology to provide superior performance and reliability. Key features include:

• High Performance, Reliable Scubapro Technology and Value: Built with Scubapro's renowned quality and engineering for consistent, dependable operation.
• Superior Ultra-High Airflow System, Maximum Performance in All-Temperatures & Conditions: Delivers ample air volume even under demanding conditions, ensuring comfortable breathing.
• Internal Parts Fully Insulated to Dramatically Improve Cold Water Performance: Designed to resist freezing in cold water environments, enhancing safety and functionality.
• Air-Balanced Flow-Thru-Piston Design, Balanced Composite/Stainless Steel Flow-Thru-Piston: Provides consistent intermediate pressure regardless of tank pressure, leading to effortless breathing.
• Diver-Adjustable Inhalation Effort, Diver-Adjustable Venturi-Initiated Vacuum Assist (VIVA): Allows divers to customize breathing resistance and prevent free-flow, optimizing comfort and air consumption.

3. Setup Instructions

Proper setup is crucial for safe and effective diving. Follow these steps carefully:

1. Inspect Components: Before each dive, visually inspect all parts of the regulator for any signs of damage, cracks, or wear. Check O-rings for integrity.
2. Connect First Stage to Tank Valve:
   • Ensure the tank valve O-ring is present and in good condition.
   • Align the yoke fitting of the MK25 first stage with the tank valve.
   • Hand-tighten the yoke screw firmly until secure. Do not overtighten.
3. Attach Hoses:
   • Connect the high-pressure hose (usually thinner) to your pressure gauge.
   • Connect the low-pressure hose (usually thicker) to your A700 second stage.
   • Connect other low-pressure hoses to your BCD inflator and alternate air source (octopus), if applicable.
4. Check for Leaks: Slowly open the tank valve. Listen for any hissing sounds indicating air leaks. Observe your pressure gauge to ensure it reads the tank pressure accurately and does not drop rapidly.
5. Purge Second Stage: Briefly press the purge button on the A700 second stage to ensure air flows freely.

Important: Always perform a pre-dive safety check before entering the water. If you detect any issues, do not dive and consult a certified technician.

4. Operating Instructions

The Scubapro MK25/A700 regulator is designed for intuitive operation. Here are key operational aspects:

4.1. Breathing Underwater

• Insert the mouthpiece of the A700 second stage into your mouth, ensuring a comfortable and secure fit.
• Breathe naturally and calmly. The air-balanced design of the MK25 first stage and A700 second stage provides smooth, effortless inhalation and exhalation.
• Monitor your air supply frequently using your submersible pressure gauge (SPG).

4.2. Adjusting Inhalation Effort (A700 Second Stage)

The A700 second stage features a diver-adjustable inhalation effort knob. This allows you to fine-tune the breathing resistance:

• To Increase Effort (Stiffer Breathing): Turn the knob clockwise. This can be useful in strong currents or when conserving air.
• To Decrease Effort (Easier Breathing): Turn the knob counter-clockwise. This provides maximum breathing comfort, ideal for relaxed diving.

4.3. Venturi-Initiated Vacuum Assist (VIVA) (A700 Second Stage)

The VIVA switch helps prevent free-flow on the surface and assists breathing underwater:

• Pre-Dive/Surface (MIN/PRE-DIVE position): Set the VIVA switch to the "MIN" or "PRE-DIVE" position to prevent free-flow when the regulator is out of your mouth or on the surface.
• Underwater (MAX/DIVE position): Once submerged, switch the VIVA to the "MAX" or "DIVE" position. This optimizes airflow and reduces breathing effort.

5. Maintenance and Care

Proper maintenance extends the life of your regulator and ensures its safe operation. Follow these guidelines:

5.1. After Each Dive

• Rinse Thoroughly: Immediately after each dive, rinse the entire regulator thoroughly with fresh, clean water. Ensure the dust cap is securely in place on the first stage to prevent water from entering.
• Soak (Optional): For a more thorough rinse, you may soak the regulator in a basin of fresh water for 15-30 minutes. Gently agitate to dislodge salt crystals.
• Dry: Allow the regulator to air dry completely in a shaded, well-ventilated area. Avoid direct sunlight or heat sources.
• Do NOT Press Purge Button: Never press the purge button on the second stage while rinsing or soaking unless the first stage is pressurized and connected to a tank. This can force water into the second stage.

5.2. Storage

• Store your regulator in a cool, dry place, away from direct sunlight, chemicals, and extreme temperatures.
• Avoid kinking or sharply bending hoses during storage.

5.3. Professional Servicing

Your Scubapro MK25/A700 regulator requires periodic professional servicing by a certified Scubapro technician. This typically includes:

• Annual Inspection: An annual check-up to ensure all components are functioning correctly and to identify any potential issues.
• Overhaul: A complete overhaul, including replacement of O-rings and other wear parts, is recommended every 100 dives or every two years, whichever comes first. Refer to your Scubapro dealer for specific service intervals.

6. Troubleshooting

This section addresses common issues you might encounter with your regulator. For problems not listed here, or if solutions do not resolve the issue, contact a certified Scubapro service technician.

7. Specifications

Detailed specifications for the Scubapro MK25/A700 Regulator:

8. Warranty and Support

For detailed warranty information, please refer to the warranty card included with your product or visit the official Scubapro website. Scubapro offers a comprehensive warranty against defects in materials and workmanship, subject to terms and conditions.

Customer Support:

• For technical assistance, service, or parts, please contact your authorized Scubapro dealer or visit the Scubapro Store on Amazon.
• Always ensure that any servicing or repairs are performed by a certified Scubapro technician to maintain product integrity and warranty validity.