a device for blowing , with the aid of a pressurized fluid , containers from thermoplastic blanks closed in a blow mold including a nozzle whose end is functionally and sealingly connected to the neck of the blank and includes several solenoid valves for selectively connecting the nozzle to the source of a moderately pressurized pre - blowing fluid , to the source of a highly - pressurized blowing fluid and to an exhaust for discharging the pre - blowing / blowing fluid , respectively . the inventive device also includes a body which is mechanically associated with the nozzle , incorporates at least one reception area for receiving a solenoid valve and is selectively connectable to the nozzle .