APEKS DS4 1ST STAGE ONLY
PRODUCT DETAILS
Compact. Capable. Global cult-classic for a reason.
The Apeks DS4 First Stage is the quiet legend of modern diving — small in profile, massive in reputation. A time-proven workhorse, it earned its stripes on expeditions, deep classroom dives, and high-stakes technical setups long before it earned a place in the spotlight.
Depth delivery powered by physics, not hype
The heart of the system is an over‑balanced diaphragm valve. As you descend, it increases hose gas pressure at a rate that outpaces ambient water pressure — giving you stronger, more stable breathing performance at depth, and improved second-stage responsiveness when the dive gets serious.
Routing-friendly ports, tournament-level tidiness
With 1 high-pressure and 4 medium-pressure ports angled for intelligent hose orientation, the DS4 keeps your rig clean, reducing sharp bends, clutter, and hose stress points. It’s a favourite for divers who value symmetry, simplicity, and deliberate hose logic — without moving parts like turrets, and without unnecessary bulk.
Internally sealed against the elements
A fully environmental dry seal chamber keeps water, silt and contamination out of the spring space. That means reduced freeze risk, cleaner internals, and real resilience in environments like the North Atlantic where temperatures dip and entries get murky.
The tech-community’s “set-and-forget” favourite
Celebrated by the global technical diving community for decades, it’s trusted across deep-stop protocols, overhead training circuits, and expedition systems precisely because it has:
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No extra complexity to fail
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No bulk to snag
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No routing logic to wrestle
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No temperature swings to fear
Key Benefits at a Glance
✔ Over-balanced diaphragm for stronger gas delivery at depth
✔ 1× HP + 4× angled MP ports for clean, logical hose routing
✔ Environmentally sealed dry spring chamber protects against freezing and contamination
✔ Ultra-compact, robust machined brass body
✔ Technical-grade simplicity with expedition pedigree
Small enough for streamlined