Wipe the outlet with a clean, dry, lint-free cloth once the cylinder valve has been cracked. The threads and mating surfaces of the regulator and hose connections should be cleaned before the regulator is attached. Always use a cylinder wrench or another tightly fitting wrench to tighten the regulator nut and hose connections. Attach the regulator securely before opening the valve wide. Stand to the side of the regulator when opening the cylinder valve.
Tag leaking cylinders or cylinders with stuck valves and move to a safe, secure outdoor location.