| necessary to keep the interior of the regulator clean and the percentage of oxygen below 40% along with the slow opening of the cylinder valve (for regulators over 40% oxygen please see page 6). To attach a yoke-style first stage to the cylinder valve, follow these steps: 1. Partially unscrew the yoke screw of the first stage regulator so that the dust cap can be removed from the air inlet. 2. With the cylinder valve facing away from you, release a small amount of air from the cylinder by turning the hand-wheel anticlockwise to open the valve slightly. When air is heard exiting, immediately close the valve. This will clear any moisture or debris that may be inside the cylinder valve outlet opening. Check the O-ring is still in place. 3. Place the first stage regulator over the cylinder valve so that the inlet fitting aligns with the O-ring of the cylinder valve, and the LP hose of the primary second stage will be routed over the desired shoulder. While holding the first stage in place, turn the yoke screw clockwise. Ensure that the yoke screw mates into the small dimple on the backside of the cylinder valve, and hand tighten only - do not over tighten. 4. If a submersible pressure gauge is attached to the first stage, ensure that the gauge is facing away from you. Pressurise the regulator by slowly turning the cylinder valve handwheel anticlockwise. Continue to turn the valve handwheel anti-clockwise until it is fully open, and then turn it back 1/2 turn. 5. Listen near the first stage to check for any leakage. If leakage is detected, immerse the first stage and cylinder valve while pressurised to determine the source. 6. If leakage has teen detected, follow the procedure for removing the regulator from the cylinder valve on page 20. If air was leaking between the first stage and cylinder valve, replace or re-seat the cylinder valve 0-ring as needed and repeat the above procedure. If leakage persists, return the system to an authorised dealer. |