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The Aqua is Toyota-reliable, but it has one expensive weak point:

| Symptom | Likely cause | Fix | |---------|--------------|-----| | PO₂ drops quickly | Low O₂ tank, solenoid stuck closed | Add O₂ manually, check solenoid | | PO₂ jumps erratically | Water in cell, loose connection | Dry cell contacts, recalibrate | | Hard to inhale | Overfilled loop, scrubber wet | Vent loop, replace scrubber | | Wet loop | Torn mouthpiece, loose hose | Find & seal leak | aqua r3

Here’s a — a versatile, high-performance device typically used in diving, underwater photography, or technical rebreather systems (depending on the exact model context; most commonly refers to the Aqua Lung R3 Rebreather or the Aqua R3 underwater scooter/dry suit valve ). The Aqua is Toyota-reliable, but it has one