Trident Below Water Sub Duck Signal Device Scuba Pro Trident Scuba-Alert for:ScubaPro A.I.R. 2AtomicTUSA Duo-AirPerfect addition for your BCD with alternate air configurations. Now you can signal your dive buddy on the surface or underwater. Safely feel at ease with your diving and knowing that you can signal your dive buddy or boat if you find yourself down wind and not visible. Dive safe with your below water sub duck.
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