Apeks XTX40 DIN Dive Regulator with Nitrox DS4

Follow the interval in your regulator's manual, since manufacturers commonly specify an annual inspection or a set number of dives and many warranties depend on it. A regulator is life-support equipment, so service belongs with a factory-trained technician rather than being attempted at home. Have it looked at sooner than scheduled if you notice increased breathing effort, free-flow, bubbles, or water in the second stage.

Make sure the dust cap is dry and firmly seated over the first-stage inlet before the regulator goes anywhere near water, because water inside the first stage is the leading cause of internal corrosion. Rinse in fresh water without pressing the purge button, since purging while depressurized can draw water back into the second stage. Shake out the water and hang it to dry with the hoses in wide, gentle loops rather than tight bends.

Regulators travel well and are usually best carried in hand luggage where they will not be crushed or lost. A regulator holds no gas of its own, so there is nothing inherently problematic about it on an aircraft, though the airline and security screeners always have the final say. Pack it dry with the dust cap in place, in a padded regulator bag or wrapped in soft gear.

Many modern regulators are supplied as suitable for nitrox mixes up to 40 percent oxygen, which is the widely used recreational industry standard, while anything above that requires dedicated oxygen-clean equipment and procedures. Confirm what your specific regulator's manual states, and follow your nitrox training and your fill station's requirements. Never assume a regulator is oxygen-service clean simply because it looks clean or is new.

A yoke (A-clamp) fitting clamps over the tank valve and is the most common connection across much of the recreational world, while a DIN fitting screws into the valve and is standard in much of Europe and in technical diving. DIN captures the o-ring inside the threads, which many divers consider more secure, but yoke is often what rental cylinders provide. Adapters exist in both directions, so check what is used where you dive before deciding.

The octopus is your backup second stage, carried so you can share air with a buddy who is out of gas, or breathe from it yourself if your primary fails or free-flows. It is normally on a longer, brightly colored hose so it is easy to find and hand over under stress. Secure it in the triangle between your chin and the bottom of your rib cage so it is instantly accessible and not dragging through sand or coral.

Store it fully dry, out of sunlight, with the dust cap in place and the hoses in wide loops rather than tightly coiled. Avoid hanging it by the second stages for long periods, which stresses the hose fittings; laying it flat in a padded bag or hanging it by the first stage is kinder. If it has sat unused for a long stretch, have it checked before your next trip rather than assuming it is ready to dive.

The DS4 first stage has one high-pressure port in 7/16" UNF and four medium-pressure ports in 3/8" UNF. The ports are angled to help route hoses cleanly, so you can run a primary second stage, an octopus and a low-pressure inflator while the single HP port carries your pressure gauge or air-integrated transmitter.

Yes. The DS4 can be converted from a right-handed hose configuration to a left-handed one, which gives you flexibility in how the second stage and other hoses are routed. Apeks specifies that this conversion should only be performed by an Apeks Authorised Service Technician so the regulator continues to function correctly and safely.

The second stage is supplied with the small exhaust tee only. It uses the Diver Changeable Exhaust (DCE) system, so you can switch to a large exhaust tee that pushes bubbles wider for minimal interference, a setup many underwater photographers prefer, while the small tee stays more compact and comfortable in everyday use.

Yes, it is rated for coldwater use. The DS4 first stage is environmentally sealed with an environmental dry system that keeps water out of the main spring chamber, preventing ice buildup and blocking silt and contamination. The second stage adds a patented heat exchanger around the valve mechanism that dissipates the cold of gas expansion using ambient water warmth.