The Apollo Bio A-320 Int’l Nitrox Bio A-320 Int’l Nitrox with Adjustable 2nd Stage is a second-stage regulator from Apollo – the piece that delivers air to your mouth on demand. Balanced and responsive, it breathes effortlessly at depth, making every breath as easy as the last whether you’re cruising the reef at Perhentian’s crystal-clear waters or hovering in the blue.
Technical Specifications
| Specification | Details |
| Brand | Apollo |
| Product | Bio A-320 Int’l Nitrox Bio A-320 Int’l Nitrox with Adjustable 2nd Stage |
| Stage | 2nd Stage |
| Type | Air balanced |
| Material | Chrome / Brass |
| Connection | DIN / Yoke |
| Best For | Recreational diving |
Key Features
- Balanced demand valve: Delivers air smoothly and effortlessly at any depth.
- Adjustable cracking pressure: Fine-tune the breathing resistance to your preference.
- Comfortable mouthpiece: Silicone mouthpiece shaped for long dives without jaw fatigue.
- Purge button: One-touch clearing keeps the regulator ready to breathe.
Suited for Malaysian Dive Sites
The Apollo Bio A-320 Int’l Nitrox Bio A-320 Int’l Nitrox with Adjustable 2nd Stage is built to perform across Malaysia’s best underwater destinations. Whether you’re exploring Perhentian’s crystal-clear waters, or heading to new reefs and wrecks, this gear delivers the reliability and comfort you need on every dive.
Care & Maintenance
- Rinse after every dive.
- Purge a few times before and after each dive to flush sand.
- Replace the mouthpiece when it starts to harden or crack.
- Service alongside the first stage – they’re a system.
Final Verdict
Every breath underwater starts here. The Apollo Bio A-320 Int’l Nitrox Bio A-320 Int’l Nitrox with Adjustable 2nd Stage delivers smooth, effortless air at any depth – exactly what you want from a second stage.





Victor Tan –
The adjustable second stage really makes a difference, especially when diving in stronger currents. Breathing feels easy and comfortable throughout my dives. The mouthpiece is quite comfortable too.
[email protected] –
Thank you, Victor, for your positive feedback. We’re glad you appreciate the adjustable second stage and comfort of the Bio A-320 regulator. If you ever need tips on maintenance or adjustments, please let us know.
Chong Wei Ling –
Is this regulator suitable for cold water dives below 10°C? I want to make sure it won’t free-flow in colder environments.
Junhao Lo –
Hi Chong, thank you for your question. Yes, the Apollo Bio A-320 Int’l Nitrox features an integrated heat exchanger, which improves cold-water performance and helps prevent free-flowing even in temperatures below 10°C.
Faridah Hassan –
Overall, this is a sturdy and reliable regulator. I like that it’s nitrox compatible up to 40%. Just wish the controls were marked a bit clearer for quick adjustments underwater.
[email protected] –
Thank you, Faridah, for your feedback and suggestion. We appreciate your input on improving the control markings and will share it with our product team for future updates.