Apeks

Apeks XTX40 (DIN)

Apeks's most accessible diaphragm regulator, pairing the DS4 first stage with a diver-adjustable second stage well under XTX50 money.

Environmentally sealed, cold-water rated

Sealed first stage keeps water and ice crystals out of the internal mechanism, the standard for diving below 50°F/10°C.

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$599
Released—
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure—
HP / LP ports2 / 4
Adjustable 2nd stageYes
Weight1100g
Nitrox-ready (EAN40)Yes
Octo includedNo

"HP / LP ports" is the number of high-pressure and low-pressure ports on the first stage, which caps how many accessories (transmitter, SPG, inflator, second second-stage) you can run at once.

Pros
  • Environmentally sealed DS4 first stage brings cold-water capability down to Apeks's entry price tier
  • Diver-adjustable opening effort control knob, not a given at this price point
  • Noticeably cheaper than the XTX50 while sharing the same balanced, sealed diaphragm philosophy
Cons
  • Lacks higher-end touches like the Diver Changeable Exhaust system found on the XTX100/XTX200
  • No octopus included in the base listing
  • Max working pressure isn't clearly published, confirm the DIN insert rating with the retailer before buying

The XTX40 is Apeks’s entry point into diaphragm regulators, pairing the DS4 first stage with a pneumatically balanced, diver-adjustable second stage at a price well under the XTX50. It’s a sensible pick for divers who want Apeks’s sealed, cold-water-capable diaphragm design without paying flagship prices.