Green and yellow markings identify this Apeks regulator for use with high-percentage oxygen mixes (up to 100% O2). It pairs the XTX40 second stage with the compact DS4 first stage and is supplied with a DIN connection and a braided flexi-hose. Apeks rates it suitable for cold water (below 10 °C / 50 °F).

Main features

• DS4 first stage with an over-balanced diaphragm design for performance at depth.
• Four medium-pressure ports on a fixed head.
• Environmental dry system keeps water, silt and contamination out of the main spring chamber and prevents ice build-up.
• Diver Changeable Exhaust system; the narrow tee is supplied.
• Pneumatically balanced second stage with progressive purge and venturi lever.
• Comfo-bite mouthpiece.

Technical specifications

• Connection: DIN
• First stage weight (DIN): 1,100 g (39 oz)
• MP ports: 4 (3/8 in UNF)
• Certified for cold water use (EN250A): yes
• Nitrox and oxygen: up to 100% O2 when new, out of the box

Good to know

The second stage can be reversed for right- or left-hand hose routing; Apeks states this must be done by an authorized Apeks technician.

Options on this listing

This page is the XTX40 DS4 Nitrox regulator with a DIN connection (part number 726001BCGNNX).