Doseem MED air breathing device dsba6.8p is such a kind of air breathing device. It is used for firefighters or emergency rescue personnel to carry out safe and effective fire fighting, rescue and relief work and rescue work under the environment of dense smoke, poisonous gas, steam and hypoxia, etc. It is an ideal personal respiratory protection device for firefighters or emergency rescue personnel. It consists of full cover, air supply valve, gas cylinder, self-locking cylinder valve, pressure reducing valve, high pressure pipe, medium pressure pipe, back plate, alarm whistle and mechanical pressure gauge.