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A scuba cylinder valve or pillar valve is a high pressure manually operated screw-down shut off valve fitted to the neck of a scuba cylinder to control breathing gas flow to and from the pressure vessel and to provide a connection with the scuba regulator or filling whip. [1]
Inability to achieve neutral or positive buoyancy, and potential difficulty or inability to make controlled ascent or to ascend at all. Catastrophic leak in buoyancy compensator: Loss of manifold fitting. Corrugated hose failure. Torn bladder. Maintenance and inspection of BC before use. Use of drysuit as emergency buoyancy control device
A kayak is a low-to-the-water, canoe-like boat in which the paddler sits facing forward, legs in front, using a double-bladed paddle to pull front-to-back on one side and then the other in rotation. [1] Most kayaks have closed decks, although sit-on-top and inflatable kayaks are growing in popularity as well. [2]
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Freezing of water in contact with the first stage can lock it open, initiating a free-flow which will further cool the regulator. The only way this can be stopped is to close the supply valve from the cylinder. Then the diver must switch to an alternate regulator that receives its gas supply from a different cylinder valve.
Sea kayak decks typically include one or more hatches for easy access to the interior storage space inside. Kayak decks usually include attachment points for deck lines of various kinds, which are aids in self-rescue and attachment points for above-deck equipment or luggage. Cockpits can be of several designs. They can be large or small.