Apeks DS4 First Stage Regulator

Apeks DS4 First Stage Regulator

Sale price£210.00 Regular price£255.00
Save £45.00

The Apeks DS4 First Stage is a workhorse with years of tested and proven experience preferred by the most demanding technical divers. Ideal for twinset configuration.


Dispatched in 1 to 2 days

Contact Form & Details

How can we help?

If you need to contact us for any issue or assistance, you can do so online by filling out the online Contact Form, emailing us at sales@dirdirect.com or calling us on +44(0)1305 824 555. If it's about a purchase you've made for us please also include your order number.

Our brick-and-mortar store Underwater Explorers based on Portland, Dorset is staffed 7 days a week, including weekends and bank holidays. As it's an active store visited by divers from around the country and world regularly, if we can't make it to the phone for any reason please leave a message and we'll get back to you asap.

Any queries are usually answered the very same day and at most within 24 hours.


Why Portland?

We’re located on the Isle of Portland (in Dorset) because Portland has been one of the most popular scuba diving locations in the United Kingdom even before we set up operations here back in the year 2000.

On one side, we’re minutes away from the sheltered waters of Portland Marina and Harbour, while on the other, it’s just a brief walk to reach our famous scuba diving destination Chesil Cove and start of the 16-mile-long Chesil Beach.  

Portland’s location makes it ideal for scuba diving, freediving, snorkelling and other surface water sports activities. 

Check out how many wrecks we have around here by clicking on Scimitar Diving's Wreck & Dive Sites chart!

Alongside dive clubs, many instructors and dive schools travel here to train and offer scuba diving certification ranging from open water diver to mixed-gas tech diving or rebreather diving levels.

Whether you’re doing a boat dive from Portland Marina or Castletown or a shore dive at Chesil Cove, Portland is well known for offering many possibilities: Reef diving to wreck diving and night diving, underwater photography or underwater videography. Anything other than cave diving is possible here.

Likely being the best-stocked diving shop in the UK, at Underwater Explorers we offer in-store scuba diving equipment advice and sales, as well as gas fills, to locals and visitors (read About Us).

But... If you’re googling “scuba diving shop near me” like some, look no further, there's DirDirect online.

Here at DirDirect, we list our cutting-edge equipment for worldwide delivery and we’ve got you covered whatever your level of diving: We’re your local dive store wherever you are in the world.

All that with over 20 years of experience especially in technical diving, from training to equipment, advice and sales.


Underwater Explorers, Unit 1, Maritime Business Centre
Mereside, Portland, Dorset, DT5 1FD


The APEKS DS4 First Stage: High-Performance & Durable

The APEKS DS4 First Stage regulator is popular for divers of all levels, whether diving a single tank or twinset, or using it on stage bottles.

Its reputation among divers is that it is “bombproof”, renowned for its durability, performance, and ease of use, even on the deepest dives.

The DS4 features an over-balanced design, which means that the intermediate pressure increases more than the ambient pressure as a diver descends, which results in a smoother breathing experience at depth.

As a regulator that uses a diaphragm to control the gas flow instead of a piston, it is often regarded as more durable with more reliable performance in cold water.

The DS4 1st stage also has an environmentally sealed dry chamber preventing water from coming into contact with the first stage spring to prevent freezing.

In summary... The Apeks DS4 1st Stage is a reliable workhorse with its 4 intermediate-pressure and one high-pressure port. It’s a well-respected regulator in the diving community and a good choice for divers looking for a high-quality regulator that will last many years without breaking the budget.

While Apeks manufactures the DS4 in DIN and Yoke configurations (like its other first stages), we only keep the more reliable and robust DIN first stages in stock and supply Yoke per demand.

Apeks DS4 features

  • Diaphragm-type design for durability and cold-water performance
  • Over-balanced design for smooth breathing at depth
  • Environmental dry system to prevent water contact with spring
  • Four medium-pressure ports and one high-pressure port
  • Available in (recommended) DIN and Yoke (A-Clamp) configurations

Apeks DS4 Pros

  • Durable and reliable
  • Smooth breathing at depth
  • Cold water capable
  • Can be used in right side up or upside down for HP port positioning
  • Easy to use
  • Finished in highly polished chrome
  • Widely available
  • Easy to service
  • Finished in highly polished chrome

Apeks DS4 Cons

  • Only 1 HP port (no option for transmitter + SPG combination)
  • No swivelling turret
  • No 5th Port Option 

The DS4 is also available in a swivelling turret form with two HP ports as the Apeks DST model, which is excellent for hose routing whether you're diving single tank, twinset or using it on stage bottles. The 5th port option of the Apeks DST also makes it ideal for sidemount diving.

SKU: RT134113