Gas-pressure reducing and stabilizing device for use in connection with equipment designed for delivering gases of various kind for medical applications, comprising a case-like body (8) housing first and seconds valve means (12, 13) connected to a conduit of the gas supply installation and the respective apparatuses for the delivery of the gas at a reduced pressure to the patients. The inventive device further comprises removable pressure-regulating means (14) provided between said first and seconds valve means (12, 13) and so shaped as to both enable the gas pressure to be reduced and stabilized and a positive gas-flow shut-off to be or not be created between the gas supply and the gas outflow from the same device.
