7. Pick your BC up by the shoulder straps to see if the cylinder slips in the tank strap (figure 3-19). If the cylinder moves, you must tighten the strap around the cylinder. 8. Pick your regulator up and turn it so that the second stage hose extends to your right and, for most regulators, the gauges and low-pressure inflator hose to your left. Make sure that the knurled (ridged) knob of the yoke screw is facing your stomach. 9. Attach the regulator to the cylinder using one of the following methods: • For a United States-made regulator, slip the yoke down over the cylinder valve (figure 3-20). The inlet for the first stage will match up with the outlet from the cylinder valve. The inlet for the first stage of the regulator will fit right into the indentation on the cylinder valve and against the cylinder’s O-ring. Tighten the yoke screw only until it is finger tight. • For a DIN valve regulator, screw the first stage into the DIN valve only until it is finger tight. 10. Tighten the yoke screw only until it is finger tight (figure 3-21). Do not use force. The O-ring will form an airtight seal when you turn on the cylinder. 11. Connect the low-pressure inflator hose from your first stage to the power-inflator hose on your BC (figure 3-22). 12. Hold your console so that your submersible pressure gauge (SPG) is facing away from you, anyone else, or other gear. It is best to point the face down when you turn on your cylinder. There is a very slight chance that the glass face of the SPG could pop off, should the inner workings and the pressure relief fail. NAUI Scuba Diver 56 Diving Skills FIGURE 3-18. YOUR BC MUST BE POSITIONED AT THE CORRECT HEIGHT IN RELATION TO THE CYLINDER. FIGURE 3-19. BE SURE THAT YOUR CYLINDER DOES NOT SLIP IN THE TANK STRAP. FIGURE 3-20. THE OUTLET FROM THE CYLINDER VALVE MATCHES UP WITH THE INLET FROM THE FIRST STAGE WHEN YOU HAVE THE REGULATOR POSITIONED CORRECTLY.
19116TC
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