Apeks

Apeks XTX50 (DIN)

A lighter, environmentally sealed diaphragm reg aimed at divers who want cold-water reliability without piston-first-stage bulk.

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 XTX50 (DIN)
4.5Comparison Score
$749
Released2005
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure300 bar
HP / LP ports2 / 4
Adjustable 2nd stageYes
Weight1139g
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 diaphragm first stage handles cold and silty water without a separate seal kit
  • Noticeably lighter than piston-based competitors at a similar price point
  • Reversible Venturi System lets you swap hose routing without extra parts
Cons
  • Costs more than Apeks's non-sealed diaphragm options for divers who only ever dive warm water
  • Also sold in a yoke version, confirm the listing matches this DIN spec
  • No octopus included in the base set
Diver community sentiment
Well-liked

Across multiple Scubaboard threads, divers consistently describe the XTX50 as an easy-breathing, reliable mid-range regulator, often comparing it favorably to pricier models and noting the second stage is essentially identical to the higher-end XTX100/XTX200. Cold-water performance is repeatedly praised, with reports of trouble-free use down to 28-34°F water. The main gripes are minor: service kit costs, the first stage's non-replaceable valve seat (requiring full body replacement if damaged), and occasional difficulty sourcing parts outside Apeks's dealer network, partly offset by Apeks's "Free Parts For Life" program.

Scubaboard: Apeks XTX50 discussionScubaboard: XTX50 vs others comparisonScubaboard: XTX50 cold-water suitability

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

The XTX50 is Apeks’s mid-tier diaphragm reg, built around the same environmentally sealed first stage as their higher-end technical line but paired with a simpler second stage. It’s a common recommendation for divers who want cold-water capability without stepping up to a full technical setup.