In a driver restraining gas bag system for vehicles a compressed gas container is arranged clear of the steering wheel and connected by way of a gas duct with an inflation opening of the bag for filling the gas bag arranged on the steering wheel hub. At its entry into the steering wheel the gas duct means is sealed off by an annular sealing gap between a first gap defining surface formed on the steering wheel hub and an oppositely arranged second gap defining surface on a wall, which is stationary in relation to the vehicle's bodywork, of the gas duct means without contact between these gap defining surfaces.