Can you install a hose directly to the outlet header of a fuel gas drop station or an oxygen drop station without a regulator?

Answer For the fuel, No, OSHA code 253(c)(4)(v) states "Portable outlet headers for fuel-gas service to be provided with an approved hydraulic back-pressure valve...unless an approved pressure-reducing regulator, an approved back-flow check valve, or an approved hydraulic back-pressure valve is installed at each outlet." In other words, there must be either an approved check valve or an approved regulator or an approved hydraulic back-pressure valve between the hose and the fuel drop station (outlet header) For the oxygen, Yes. OSHA states "Outlets provided on headers for oxygen service may be fitted for use with pressure-reducing regulators or for direct hose connection." You can use an oxygen regulator or directly to the pipe.