Engineered for depth, tuned for Nitrox. The performance powerhouse of technical diving just got better.

Meet the precision-built Apeks XTX DS4 Nitrox — a regulator system designed for divers who don’t compromise when breathing gases beyond air. Combining the rugged simplicity of the DS4 first stage with the refined breathability of the XTX second stage, this is reliability redefined for enriched oxygen diving.

The DS4 first stage delivers over‑balanced diaphragm technology that actively boosts hose gas pressure faster than ambient pressure as you descend — giving you measurably smoother, stronger performance exactly when it matters most: at depth. Its 2 HP ports and 4 MP ports are intelligently angled for clean, streamlined hose routing, reducing drag and stress — perfect for twin-set and stage-heavy configurations.

Cold water or low-vis silt? Bring it on. The environmental dry system seals the spring chamber from water and contaminants, protecting against freezing and keeping internals clean — a must in our challenging UK conditions, from Stoney Cove training days to coastal wreck expeditions.

The XTX second stage elevates every breath. pneumatically‑balanced valve design ensures effortless inhalation, while the oversized venturi lever and opening-effort control knob put you in command of airflow and resistance. The progressive 2-stage purge lets you deliver a gentle assist for bag fills or full blast for instant clearing — control your gear, not the other way around.

Safety where you can’t see it: every moulded component includes active antimicrobial protection, defending against bacteria, fungi, viruses — even hard-to-kill nasties like MRSA and E‑coli. Cleaner gear, safer diving.

Built with patented heat-exchange fins that recycle ambient water warmth during gas expansion, a premium silicone exhaust valve, and the Comfo-bite™ mouthpiece that dramatically reduces jaw fatigue. It doesn’t just perform beautifully — it feels exceptional on every dive.

If you dive EANx, this is your breathing system.

Dive deeper. Dive cleaner. Dive confidently on Nitrox.

APEKS XTX40 DS4 NITROX