# Atomic Aquatics B2 vs Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE"): specs and price compared

A sourced, side-by-side comparison of the Atomic Aquatics B2 (Atomic Aquatics) and Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") (Hollis) among dive regulators.

## Side by side

| Spec | Atomic Aquatics B2 | Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") |
| --- | --- | --- |
| US price | not published | $749.95 |
| Brand | Atomic Aquatics | Hollis |
| First stage type | piston | diaphragm |
| Balanced | Yes | Yes |
| Din or yoke | DIN and yoke | DIN and yoke |
| Hp lp ports | 2 HP / 5 LP (on swivel cap) | 2 HP / 5 LP |
| Cold water rated | — | Yes |
| Environmentally sealed | Yes | Yes |
| Adjustable venturi controls | AFC (Automatic Flow Control) with manual detune knob | diver-adjustable inhalation knob + adjustable dive/pre-dive venturi switch |
| Weight (g) | 1134 | — |

## Key differences

- First stage type: Atomic Aquatics B2 piston vs Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") diaphragm
- Hp lp ports: Atomic Aquatics B2 2 HP / 5 LP (on swivel cap) vs Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") 2 HP / 5 LP
- Adjustable venturi controls: Atomic Aquatics B2 AFC (Automatic Flow Control) with manual detune knob vs Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") diver-adjustable inhalation knob + adjustable dive/pre-dive venturi switch

## Sources

- Atomic Aquatics B2: https://www.atomicaquatics.com/product/b2-regulator/ (atomicaquatics.com, verified 2026-08-11)
- Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE"): https://www.hollis.com/product/200lx/ (hollis.com, verified 2026-08-11)

Canonical: https://frontdeskreview.com/gear/dive-regulators/atomic-aquatics-b2-vs-hollis-200lx-dcx/
Cite: Per The Front Desk Review, Atomic Aquatics B2 (not published) vs Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") ($749.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/dive-regulators/atomic-aquatics-b2-vs-hollis-200lx-dcx/
License: CC BY 4.0.