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Product Information
Introducing the innovative APEKS Compact First Stage, designed for the ultimate diving experience. This first stage is equipped with four medium-pressure ports and one high-pressure port, providing versatility and convenience for divers.
One standout feature of this first stage is the Diver Changeable Exhaust system (DCE), allowing users to switch between a small exhaust tee and a large exhaust tee. This unique feature gives divers the freedom to customize their regulator based on their specific needs - whether it be minimizing bubble interference for underwater photography with a wider exhaust tee, or opting for a compact and comfortable regulator with a narrow exhaust tee.
Not only does the APEKS Compact First Stage offer flexibility in exhaust tee options, but it also allows for easy conversion from a right-handed hose configuration to a left-handed one. While the process of changing configurations is quick and simple, it is important to note that this procedure should only be performed by an APEKS Authorized Service Technician for safety and optimal performance. Experience the convenience, versatility, and comfort of the APEKS Compact First Stage on your next dive. Choose a regulator that puts your needs first and enhances your underwater adventures like never before.
First Stage
- DS4 first stage.
- Unique over-balanced, diaphragm design - as the diver descends, the over-balancing feature allows the medium pressure gas in the hose to increase at a rate faster than ambient. This results in superior performance at depth.
- 2 HP ports and 4 MP ports are angled for optimum hose routing.
- An environmental dry system keeps water out of the main spring chamber thus preventing ice buildup and keeping silt and contamination out.
Second Stage
- Pneumatically-balanced second stage results in smooth, easy breathing.
- The XTX purge buttons are large and easy to operate. A 2-stage progressive purge is used - press the purge on the side for a lower flow rate, useful where more control is required such as filling lift bags etc, then press in the centre for the full effect of the purge, i.e. when regulator clearing etc.
- The large venturi lever has a soft touch rubber grip, which makes it easier to locate and use. The lever reduces the amount of grit ingress and therefore resists any possible friction giving a smooth operation.
- Easy-to-grip opening effort control knob keeps the diver in control.
- The second stage is manufactured with active protection against infection as all molded parts are produced with an additive that kills MRSA, protects against E-Coli, bacteria and fungi, and is also very effective against viruses, mould, yeast and algae.
- A silicone exhaust valve improves the breathing performance of the regulator.
- The Comfo-bite™ mouthpiece virtually eliminates jaw-fatigue.
- A heat exchanger (patented) which surrounds the valve mechanism, dissipates the cold caused by gas expansion while drawing in the warmth of the ambient water.
- Connections: DIN and Yoke
- Type of first stage: Over-balanced diaphragm design, environmentally sealed
- Body Type: Cylindrical
- Number of HP ports: 1 (7/16" UNF)
- Number of MP ports: 4 (3/8" UNF)
- Environmental Dry Kit: Standard
- First stage exterior: Chrome over marine brass
- Orientation: Convertible LH or RH
- Coldwater Use: Yes
- Type of second stage: Pneumatically balanced
- Opening Effort Control Knob: No
- Integrated Venturi Lever: Yes
- Mouthpiece: Comfo-bite™
- Exhaust tee: Diver Changeable - comes with 1 set
- Heat Exchanger for freezing resistance: Yes
- Hose type: Braided Flexi-hose
- Overall work of breathing (WOB) scores: Avg. 0.70 joules/liter
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Frequently Asked Questions
How often does a scuba regulator need servicing?
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.
How do I rinse and care for a regulator after diving?
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.
Can I fly with a scuba regulator?
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.
Can I use my regulator with nitrox?
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.
What is the difference between DIN and yoke regulators?
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.
What is the octopus regulator for?
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.
How should I store a regulator between dive trips?
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.
