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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]
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]
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
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Hurley Lock – lock and weir on the River Thames in England, situated in a clump of wooded islands close to the village of Hurley, Berkshire. Boulter's Lock – lock and weir on the Thames River in England. A canoe/kayak flume is installed annually on the weir during the summer and there is a permanent fixed ramp in front of the third of the ...
Positive buoyancy: when the diver wants to float on the surface. A small amount of positive buoyancy my be used to ascend, but the diver must monitor it constantly and vigilantly to keep from ascending too quickly. To achieve negative buoyancy, divers may need to carry supplemental weights to counteract any excess buoyancy. [24]
To ascend, the diver fins upward, generally assisted by buoyancy as the surface is approached. In competitive freediving the techniques for descent and ascent are largely specified by the rules of the specific discipline, and are quite varied, and range from unaided swimming, to pulling oneself along a shotline, to descending using a heavy ...
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.