QC-RHPRSP Pair Quick Connectors provide fast, reliable, and easy setup for welding, cutting, and brazing applications. They ensure pressure-tight connections made in seconds. Built-in automatic reset check valves prevent reverse flow of gas by cutting off the gas under back pressure. Oxygen and Fuel gas models are no interchangeable in order to prevent wrong connections. Pair comes with QC-RHF (fuel) & QC-RHX (oxygen). Gas must be shut off at regulators when disconnected. Color-coded for fast, efficient, and safe handling.