DS4 First Stage (DIN, Used)

Apeks

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Description

DS4 First Stage (DIN, Used) by Apeks

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Used Apeks DS4 First Stage (DIN): The Legendary Tech Diving Workhorse!

Here is a fantastic opportunity to get one of the most trusted first stages in technical diving at an incredible price! This is a lightly used Apeks DS4 DIN First Stage, a legendary workhorse known for its incredible reliability and rock-solid performance in the most demanding conditions.

The Go-To First Stage for Technical Divers:

For years, the DS4 has been a top choice for technical divers building clean and reliable twinset (doubles) and sidemount configurations. Its reputation is built on its simple, rugged, and completely dependable design that just works, every time.

Engineered for Performance at Depth:

The DS4 is packed with features for serious diving.

  • Over-Balanced Diaphragm: This high-performance design increases the intermediate pressure at a faster rate as you descend. Why this matters: This compensates for the increasing density of your breathing gas, ensuring you get a smooth and easy breath on the deepest part of your dive.
  • Environmentally Sealed: The internal mechanism is protected by a dry chamber. Why this matters: This is a critical feature that prevents internal icing during cold-water dives and protects the precision components from salt and contaminants, ensuring unwavering reliability.

Excellent Condition and Service History:

This isn't your average used regulator. This first stage was only used for a few dozen dives in fresh water and has been meticulously maintained with regular annual servicing.

  • Ready to Dive: It is in great, functional condition and is not due for its next professional service until May 11, 2026.

This is a DIN first stage with four medium-pressure (LP) ports and one high-pressure (HP) port, housed in a durable, highly polished chrome body.

Get a legendary first stage that's serviced and ready for years of diving! This well-maintained used Apeks DS4 won't last long. Order it today!

Features
  • Over-Balanced Diaphragm Design: A high-performance design that provides excellent breathing characteristics, especially at depth.
  • Environmentally Sealed: The dry chamber is ideal for cold water, as it resists internal icing and protects the mechanism from contaminants.
  • Proven Reliability: A legendary "workhorse" first stage trusted by technical divers worldwide.
  • Excellent Condition & Service History: A lightly used, freshwater-only regulator that has been annually serviced and is ready to dive.
  • Ideal for Twinsets: A long-time favorite for building clean and reliable doubles configurations.
Specs
  • Brand: Apeks
  • Model: DS4 First Stage
  • Condition: Lightly Used
  • Connection: DIN
  • Type: Over-Balanced, Environmentally Sealed Diaphragm
  • Ports: One (1) HP, Four (4) MP/LP
  • Finish: Polished Chrome
  • Service Status: Next service due May 11, 2026
Reviews
Product Q&A

Easy Returns

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Full Manufacturer's Warranty

Authorized Retailer for Apeks

We are an Authorized Dealer for every single brand we sell. This means you are getting 100% authentic gear, and your purchase is fully protected by the manufacturer's warranty. No gray-market gear, no warranty worries. We've got your back.

Our Promise to You

We\’re Divers, Just Like You

Our promise is that you get the right gear, and that it's right the first time. As divers ourselves, we'll help you find the perfect fit for your style of diving. Then, we'll quality-inspect your order before it ships to ensure it's ready for your next adventure. We're your local dive shop, no matter where you are.

California Proposition 65 Warning

Proposition 65

Safe Water and Toxic Enforcement Act of 1986 – Warnings Required

WARNING: This Dive Right In Scuba product can expose you to certain chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to  www.P65Warnings.ca.gov

We appreciate your decision to purchase Dive Right In Scuba products to provide the best in water experience. We take our job seriously! You may have noticed that our products now show a warning label at point of sale referring to carcinogens and birth defects. You may also have begun to see warnings related to carcinogenic substances or substances causing birth defects prominently displayed in hotel lobbies, hospitals, or other places of business recently. These warnings are required by the State of California, and we believe that an explanation of the California statute legislating the requirement will provide you valuable information regarding the relative risks of the chemicals that may be present in consumer products.

In 1986, the State of California passed the Safe Drinking Water and Toxic Enforcement Act; otherwise known as “Proposition 65” or "Prop 65". Prop 65 requires businesses like ours to disclose to individuals the presence of chemicals listed in the Act prior to point of sale. The regulations implementing this Act have been amended over time with the most recent updates will take effect on August 30, 2018. There are more than 900 chemicals on the Prop 65 Chemical List, including many chemicals that are found in components of a wide array of consumer goods or are used to manufacture components that make up consumer goods.

Prop 65 does not establish acceptable concentrations for any listed chemical; however, the agency which enforces it has established what is called "safe harbor" exposure levels for about one third of these chemicals below which warnings are not required. These "safe harbor" are established for listed carcinogens based on the quantity of the chemical that would result in one excess case of cancer in an exposed population of 100,000, assuming lifetime (70-year) exposure at the level in question. A similar process is used to establish safe harbor levels for listed reproductive toxicants. Additional information in plain language on safe harbor levels is available from the California Office of Environmental Health Hazard Assessment at http://oehha.ca.gov/Prop65/background/p65plain.html

At Dive Right In Scuba, the safety of your in water experience is our highest priority. We go to great effort to select materials that offer superior value, quality, and durability while also being generally recognized as safe and reliable for the full life of the product. Dive Right In Scuba also works closely with many regulatory bodies, such as the US Coast Guard and Underwriter’s Laboratories, to ensure the longevity of your on-water safety through targeted selection of durable, long lasting materials and components that undergo significant validation testing before being used to manufacture end items. Sometimes the safety promise we offer appears at odds with the health and safety requirements of other legislation in certain parts of the world when some regulations are updated ahead of others. To ensure compliance with applicable legal requirements, Dive Right In Scuba has placed a warning on products that contain a Prop 65 listed chemical, either directly or as a part of the raw material supply chain. This allows us to comply with California law and provide our California consumers with the disclosure required by Prop 65, while still promising the safest on water experience possible.

Dive Right In Scuba is working diligently with regulatory bodies and our own manufacturing partners to continue to continue to improve our product performance and reduce the presence of less desirable chemicals. Water is a precious resource we all share that is important to the health and well-being of our planet and all people. Our goal is to continue to enhance your water life experience while reducing our overall impact to the planet and, in particular, its waterways. While it is a bit of a juggling act to achieve, we are confident you will see continued improvement in both the immediate and long term future. We hope this explanation will enable you to understand why you will be seeing warnings on some our products.

Thank you for your continued use of Dive Right In Scuba products.
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