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All can be used, but the 75/25 mixture is recommended for general welding. For aluminum welding, use 100% Argon. Either type gas may be obtained at your local welding supply outlet. Secure cylinder in place on your welding machine or other support to prevent the cylinder from falling over. REGULATOR This regulator is designed to be used with straight Argon or Argon mix gas. A threaded adapter is needed if CO2 is used. An adapter is available at your local welding gas supplier to change between t