Oceanic

Oceanic Zeo / FDXi (DIN)

Oceanic's upper-tier reg, evolved from the well-regarded EOS and independently tested and praised for its breathing performance.

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.

Oceanic Zeo / FDXi (DIN)
4.1Comparison Score
$744.95
Buy on Amazon
Released2014
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure300 bar
HP / LP ports2 / 4
Adjustable 2nd stageYes
Weight800g
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
  • Independently tested by Divernet, which called the breathing performance "exemplary" and specifically noted it coped well in cold water
  • Both a dive/pre-dive venturi switch and a diver-adjustable cracking-effort knob, more control than Oceanic's cheaper lines
  • Comparatively light for its performance tier, and called travel-friendly in independent review
Cons
  • Priciest of Oceanic's current regs, a real step up over the Delta 5
  • Divernet's reviewer noted it took real digging to confirm EN250A certification status, a documentation gap worth knowing about before buying
  • No octopus included in the base first-stage/second-stage set
Diver community sentiment
Mostly positive

On Scubaboard, divers and at least one dive-shop professional describe the Zeo/FDXi as an excellent breather, with one poster saying some divers now choose it over the long-respected Atomic B2. Owners report it is comfortable and light, especially paired with the MaxFlex hose, and that the mouthpiece works well for smaller mouths. No detailed complaints about reliability, servicing, or cold-water failures turned up in these threads, though one poster noted having seen unspecified negative comments about Oceanic regulators elsewhere without further detail. Coverage specific to this exact model is thinner online than for rival brands.

Scubaboard: Zeo/FDXi shop/instructor impressionsScubaboard: Zeo owner comfort/fit report

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

The Zeo/FDXi is Oceanic’s upper-tier regulator, evolved from the well-regarded EOS and independently reviewed rather than just marketed on spec sheets. It’s aimed at divers who want performance and cold-water capability closer to boutique tech brands, without stepping up to Oceanic’s parent-company siblings like Aqualung’s LEG3ND.