Atomic Aquatics
Atomic Aquatics B2
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Best Dive Regulators · head-to-head
Atomic Aquatics B2 vs Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE")
A sourced, side-by-side comparison. Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") is cheaper at $749.95. Every spec and price links to its source.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Atomic Aquatics B2 |  Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE") |
|---|---|---|
| US price | — | $749.95 |
| Brand | Atomic Aquatics | Hollis |
| Released | — | — |
| 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 | — |
Sources — Atomic Aquatics B2: atomicaquatics.com (verified 2026-08-11). Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE"): hollis.com (verified 2026-08-11).
What's the difference between the Atomic Aquatics B2 and Hollis 200LX + DCX (current flagship, corrected from the discontinued seed "500SE")?
Where the two actually differ on the specs we track (3 of 8). Matching specs are omitted.
- 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