Holis 150LX DC7 Dive Regulator Set

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.

Both second stages are pneumatically balanced and pair with the same DC7 first stage, but the 200LX is the higher-tier model. The 200LX adds a PVD-coated brass body plus an adjustable inhalation knob and venturi lever; the 150LX is essentially the same design without the PVD coating and without the adjustable inhalation knob.

The DC7 is an over-balanced diaphragm first stage that is environmentally sealed and CE rated for cold water. It provides 2 high-pressure and 4 low-pressure ports and is rated for Nitrox up to 40%. It is the shared first stage for both the 150LX and 200LX sets.

Hollis backs these regulators with a Lifetime warranty plus Free Parts for Life, and the recommended service interval is every 2 years with inspection. Hollis warranty coverage requires purchase from an authorized dealer, and purchases from us qualify.

Yes. The DC7 first stage is suitable for both backmount and sidemount configurations. It uses fixed hose routing with 2 high pressure and 4 low pressure ports, and the 150LX second stage has a reversible demand valve that converts between right-handed and left-handed hose configuration, so you can set the hose to exit on the side your sidemount or stage bottle layout requires.

An over-balanced first stage increases intermediate pressure progressively as depth and gas density increase, so the second stage keeps delivering gas easily at depth rather than getting harder to breathe. The DC7 is also an environmentally sealed diaphragm design, which protects the internals from corrosion, contaminants and icing, and it is designed to meet CE standard requirements for coldwater performance.

The 150LX uses a chrome-plated brass pneumatically balanced valve body, and the front metal ring, packing nut and end cap are 316 stainless steel. It is fitted with an improved orthodontic mouthpiece with dual color tabs and a MiFlex braided hose. The 150LX shares the 200LX design but without PVD plating and without the diver inhalation adjustment knob.

Yes. Both the 150LX second stage and the DC7 first stage are rated for oxygen percentages up to 40%, and the set is supplied O2 cleaned in a sealed bag. Mixes above 40% require dedicated oxygen-clean equipment and procedures, so follow your training agency's standards and the Hollis manual for anything beyond 40%.