XTX40 Nitrox with DS4 Dive Regulator

Overview:
The Apeks XTX40 Nitrox with DS4 is a high-performance regulator specifically designed for oxygen-rich and pure oxygen diving applications. Fully compatible with 0–100% oxygen, this regulator is widely used by technical divers for decompression stops and stage cylinders requiring high oxygen percentages.

Built around the reliable DS4 first stage and the pneumatically balanced XTX40 second stage, this regulator delivers consistent breathing performance, exceptional reliability, and safe operation when diving with high O₂ mixtures.

First Stage Features (DS4):

• Proven DS4 first stage trusted by technical divers worldwide.

• Over-balanced diaphragm design improves breathing performance at depth.

• Environmentally sealed dry chamber prevents water, silt, and contamination.

• Excellent resistance to freezing, ideal for cold water diving.

• 1 HP port and 4 MP ports angled for optimal hose routing.

• Durable chrome-plated marine brass construction.

Second Stage Features (XTX40):

• Pneumatically balanced second stage for smooth and effortless breathing.

• Large purge buttons with progressive 2-stage purge control.

• Venturi lever with soft-touch grip prevents unwanted free flows.

• Adjustable opening effort control knob for personalized breathing resistance.

• Active antimicrobial protection against bacteria, fungi, and viruses.

• Silicone exhaust valve improves breathing performance.

• Patented heat exchanger reduces freezing risk.

• Comfo-bite™ mouthpiece reduces jaw fatigue.

• Diver-changeable exhaust system (supplied with small exhaust tee).

• Durable braided flexi-hose.

Specifications:

• Connection: DIN only

• First Stage Type: Over-balanced diaphragm, environmentally sealed (DS4)

• Body: Cylindrical with environmental dry seal

• HP Ports: 1 (7/16" UNF)

• MP Ports: 4 (3/8" UNF)

• First Stage Exterior: Chrome-plated marine brass

• Orientation: Convertible left or right

• Cold Water Use: Yes

• Second Stage Type: Pneumatically balanced

• Venturi Lever: Yes

• Mouthpiece: Comfo-bite™

• Exhaust Tee: Diver changeable (small exhaust tee supplied)

• Heat Exchanger: Yes

• Hose Type: Braided flexi-hose

• Work of Breathing: Avg. 0.85 J/l

• Nitrox Compatibility: 0–100% O₂ (when new out of the box)

• Weight: DIN – 1100 g

What’s in the Box:

• 1x First stage (DS4)

• 1x Second stage (XTX40 Nitrox)

• Regulator hose