# Atomic Aquatics B2 vs Mares Fusion 52X: specs and price compared

A sourced, side-by-side comparison of the Atomic Aquatics B2 (Atomic Aquatics) and Mares Fusion 52X (Mares) among dive regulators.

## Side by side

| Spec | Atomic Aquatics B2 | Mares Fusion 52X |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Atomic Aquatics | Mares |
| First stage type | piston | diaphragm |
| Balanced | Yes | Yes |
| Din or yoke | DIN and yoke | DIN and INT (yoke), convertible |
| Hp lp ports | 2 HP / 5 LP (on swivel cap) | — |
| Cold water rated | — | Yes |
| Environmentally sealed | Yes | Yes |
| Adjustable venturi controls | AFC (Automatic Flow Control) with manual detune knob | Twin Power flow-control switch |
| Weight (g) | 1134 | — |

## Key differences

- First stage type: Atomic Aquatics B2 piston vs Mares Fusion 52X diaphragm
- Din or yoke: Atomic Aquatics B2 DIN and yoke vs Mares Fusion 52X DIN and INT (yoke), convertible
- Adjustable venturi controls: Atomic Aquatics B2 AFC (Automatic Flow Control) with manual detune knob vs Mares Fusion 52X Twin Power flow-control switch

## Sources

- Atomic Aquatics B2: https://www.atomicaquatics.com/product/b2-regulator/ (atomicaquatics.com, verified 2026-08-11)
- Mares Fusion 52X: https://www.mares.com/en_US/product/fusion-52x-6 (mares.com, verified 2026-08-11)

Canonical: https://frontdeskreview.com/gear/dive-regulators/atomic-aquatics-b2-vs-mares-fusion-52x/
Cite: Per The Front Desk Review, Atomic Aquatics B2 (not published) vs Mares Fusion 52X (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/dive-regulators/atomic-aquatics-b2-vs-mares-fusion-52x/
License: CC BY 4.0.