Built for extremes—cold water, overheads, and high-O₂ missions.

The M1 is Atomic’s expedition regulator. It adds Monel and titanium components and comes DIN + environmentally sealed for cold, silty, or high-oxygen use. If you dive wrecks, caves, cold water, or plan staged decompression, the M1’s materials and sealing deliver confidence when conditions get tough.

Key Benefits

• High-oxygen flexibility Rated for enriched mixes with proper prep, supporting advanced and technical diving.
• Freeze-resistant reliability Fully sealed piston keeps out contaminants and prevents free-flow in cold water.
• Clean routing for tech dives Swivel turret + bottom LP port simplify hose layouts for stages or long-hose setups.

Internal Engineering & Materials

• Titanium & Monel internals Corrosion-proof and oxygen-safe for high-demand environments.
• Pneumatic balancing + AFC Keeps inhalation smooth automatically at any depth.
• Comfort swivel + silicone exhaust Easy hose angle and reduced breathing resistance on exhale.

Key Specifications

• First Stage Type Balanced piston
• Material Chrome-brass with Monel/titanium components
• Environmental Sealing Yes—factory sealed for cold/silt resistance
• Ports 2 HP / 5 LP total (swivel turret + bottom LP)
• Swivel 360° turret
• Nitrox / Oxygen EAN up to 50% or O₂ up to 80% (with O₂ cleaning)
• Total Weight ~2.6 lb (first + second stage with hose)
• Second Stage Weight ~13 oz
• Service Interval 2 years or 300 dives
• Warranty Limited lifetime (original owner)

Designed for technical and demanding environments, the M1 is the rugged Atomic choice for divers who need reliability in cold water, overheads, and high-oxygen applications.