Apeks

Apeks XTX100 (DIN)

Apeks's mid-tier cold-water workhorse, built around the over-balanced FST diaphragm first stage, now sold mostly as remaining new-old-stock.

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.

Apeks XTX100 (DIN)
4.1Comparison Score
$399.95
Released2006
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure300 bar
HP / LP ports2 / 4
Adjustable 2nd stageYes
Weight—
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
  • Over-balanced FST diaphragm first stage keeps breathing effort consistent as tanks empty
  • Environmental dry system and a cold-water rating below 10C/50F make it a genuine cold-water reg, not just a warm-water design
  • Diver-adjustable opening effort control knob on the second stage
Cons
  • Discontinued around 2018 in favor of the FSR-equipped XTX200, so it's largely sold as remaining stock rather than a current model
  • No octopus included in the base listing
  • Weight isn't reported consistently enough across retailers to publish a reliable figure
Diver community sentiment
Mostly positive

Across several Scubaboard threads, divers consistently describe the XTX100 as breathing smoothly and reliably, with more than one owner calling it "kick ass" or reporting they are "very happy" with it in both warm and cold water. Multiple experienced posters note that the XTX100's second stage internals are essentially identical to the pricier XTX200 and cheaper XTX50, so the model differences are largely cosmetic, and that breathing differences between the first stages are negligible in practice. A recurring practical complaint is that parts/service access has tightened since the model was discontinued, with dealers increasingly requiring an authorized Apeks technician for spares.

Scubaboard: XTX100 vs Aqualung Legend LX ACDScubaboard: ATX40 vs XTX100 comparisonScubaboard: XTX100 vs XTX200

Summarized from public forum discussion (Scubaboard, Reddit, and similar), not a survey we ran ourselves. See the linked threads for the original conversations.

The XTX100 was Apeks’s mid-tier cold-water regulator, sitting between the entry-level XTX40/XTX50 and the high-flow XTX200. It’s since been discontinued in favor of the FSR-equipped XTX200, so today it mostly turns up as new-old-stock or used gear, a good value if you can find one, but not a reg to plan a long-term parts-and-service relationship around.