1st & 2nd Stage Scuba Regulators
At the core of every dive setup is your primary breathing system. Whether you are building a custom regulator setup or replacing an existing core, International Diving Centre stocks world-class 1st and 2nd stage regulators engineered for ultra-smooth air delivery, reliable cold-water performance, and low breathing effort at any depth. Choose from top manufacturers including Scubapro, Atomic Aquatics, Apeks, AquaLung, Halcyon, and Hollis.
First Stage Regulators (1st Stage)
Connects to your scuba cylinder, reducing high tank pressure to an intermediate pressure. Available in balanced diaphragm or flow-through piston configurations with Yoke or DIN connections.
Second Stage Regulators (2nd Stage)
Delivers air on demand at ambient pressure directly to your mouth. Features adjustable inhalation control knobs, Venturi dive/pre-dive switches, and orthodontic mouthpieces.
Key Technologies to Consider
- Diaphragm vs. Piston First Stages: Sealed diaphragm first stages (like the Apeks DS4 or Scubapro MK19) isolate internal mechanics from cold water and sediment. Air-balanced pistons (like the Scubapro MK25 EVO) offer unmatched high-volume airflow at depth.
- DIN vs. Yoke Valve Connections: DIN connectors screw directly into high-pressure valves for a compact, blow-out-proof connection—ideal for cold water and technical diving. Yoke (A-clamp) connectors slip over standard tank valves, perfect for international travel.
- Pneumatically Balanced Second Stages: Reduces inhalation effort to near zero, giving you smooth, natural breathing performance whether your tank is full at 3000 PSI or near reserve pressure.
- Environmental Sealing (Dry Chamber): Prevents internal freezing and corrosion in chilly Pacific Northwest waters by keeping salt water and silt completely outside the first stage mechanism.
Stage Comparison Guide
| Component | Function | Key Options |
|---|---|---|
| 1st Stage Body | Reduces tank pressure (~3000 PSI) down to intermediate pressure (~135-145 PSI) | DIN 300-bar, Yoke (A-clamp), Environmental Seal, Swivel Turrets |
| Primary 2nd Stage | Reduces intermediate pressure to ambient air pressure on demand when you inhale | Adjustable VIVA/Venturi switches, Titanium valve seats, Swivel hoses |
Custom Hose Assembly & Bench Testing at IDC Vancouver: When you purchase your 1st and 2nd stages at International Diving Centre (2865 West Broadway), our certified technicians will assemble your hoses, adjust intermediate pressure (IP), and flow-test your setup free of charge!
