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.

No image yet
$749
Released—
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure—
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

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.