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.
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.
| Released | — |
| First stage | diaphragm |
| Balanced | Yes |
| Environmentally sealed | Yes |
| Cold-water rated | Yes |
| Connection | DIN |
| Max pressure | 300 bar |
| HP / LP ports | 2 / 4 |
| Adjustable 2nd stage | Yes |
| Weight | — |
| Nitrox-ready (EAN40) | Yes |
| Octo included | No |
"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.