Apeks DS4 First Stage Regulator (DIN)

By Apeks | SKU: RT134113 | 300 Bar DIN Connection | Over-Balanced Diaphragm

The Apeks DS4 1st Stage Regulator (DIN - SKU: RT134113) is the gold standard for technical, cold-water, and twinset divers worldwide. Featuring a heavy-duty 300 bar DIN connection and an over-balanced diaphragm design, interstage gas pressure increases faster than ambient depth pressure as you descend, delivering effortless breathing performance regardless of depth or cylinder pressure. Engineered with Apeks’ signature environmentally dry sealed chamber, it completely isolates internal working mechanisms from water and ice build-up, making it virtually immune to cold-water freezing and silt contamination.

Key Performance Features

• 300 Bar DIN Connection: Threaded DIN connection provides superior seal security and higher pressure handling compared to standard Yoke fittings.
• Over-Balanced Diaphragm System: Delivers increased intermediate gas pressure at deeper depths, resulting in smoother, easier breathing performance under load.
• Environmentally Dry Sealed Chamber: Protects internal components against ice formation, silt, and saltwater corrosion for extreme cold-water reliability.
• Streamlined Compact Design: Chrome-plated solid brass forged body eliminates unnecessary bulk while offering extreme impact resistance.
• Optimized Port Configuration: Equipped with 4 Low Pressure ports (3/8" UNF) and 1 High Pressure port (7/16" UNF) for tidy stage bottle or primary rig routing.
• Nitrox / EANx Compatible: Factory clean and suitable for up to 40% O2 out of the box.

Technical Specifications