49 SECOND STAGES3 - Use and Maintenance
503.1 - Use of the SCUBA and Risk AssessmentBefore using any <strong>Scuba</strong> diving equipment, you should completea proper diving course.Do not attempt to dive if weather is bad or your physical conditionis inadequate.Always watch out for underwater currents, rough sea, extremelycold water and low visibility.If you are suffering from emotional and physical stress, baddigestion, or if you lack training, diving can become dangerous.The safety risk of diving is greater if you have not gone diving fora long period of time, as your skill level has diminished.All Cressi-sub regulators are manufactured with first quality anticorrosionmaterials for use in total safety.All open circuit air regulators are designed for use down to 50 m(150ft) depth, in compliance with UNI EN 250:2000. We recommendnot exceeding 40 m (120ft) of depth for recreational diving.3.2 - Checks Before UseAlways check your cylinder pressure before entering the water.Test the regulator by pressing the purge button repeatedly tomake sure that air is flowing properly. Holding the mouthpiecebetween your teeth, inhale and exhale deeply to check if theregulator and the exhaust valves are working well. Additionally,check your octopus in the same manor.Check for air leaks at connections, hoses or leaking from the regulator. Warning: First check your regulator out of the water, bydepressing the manual outlet button repeatedly, in order tocheck the regular air outlet; then, wear your mouthpiece andmake some deep inspirations and expirations, in order to checkits perfect working (not for use in cold water < 10°C/< 50°F).The same must be done on the surface of the water, beforeplunging, wearing your mouthpiece and deeply inspiring andexpiring, in order to check its perfect working. Warning: When the regulator has been assembled on thecylinder, the equipment has to be laid horizontally to preventaccidental falls from causing damage to components or injuryto people.3.3 - Assembly of the Regulator on the CylinderBefore assembling the regulator, make sure that the cylinder hasbeen filled with compressed air at a proper working pressure.Use a suitable compressor able to supply breathable air in compliancewith UNI EN 12021. Warning: Always remember to check the cylinder valve O-ring. If it shows cuts, scratches or abrasions, replace it. Even ifit is intact, it has to be replaced every 3 months because it isconstantly exposed to the cylinder high pressure and to weathering.It is advisable to only use Cressi-sub original spare parts.The instructions indicated below must be followed for 1st Stagewith yoke connections:Unscrew the yoke screw, remove the dust cap and place itagainst the valve outlet, after making sure that the 2nd Stage ison the suitable side.Tighten the yoke screw to connect the 1st Stage. Do not overtighten.Open the cylinder valve counterclockwise and keep the 2ndStage purge button pressed until the air starts flowing. Releasethe button and open the cylinder valve completely.In order not to damage the thread, it is advisable to turn the valve1/4 of a turn clockwise.The assembly of the 1st Stage with DIN connection is not verydifferent from the procedure described above. In this case, theconnection must be screwed directly on the valve outlet withoutover-tightening.When using a second independent regulator, connect it to theadditional valve outlet following the above instructions.