1.Using in chemical, petroleum, mine 2.30,60,90,120min protective 3.Cylinder from America Detailed Product DescriptionSelf contained breathing apparatus 1.Using in chemical, petroleum, mine 2.30,60,90,120min protective 3.Cylinder from America Self contained breathing apparatus(SCBA) This Self-contained Positive Compressed Air Breathing Apparatus is widely used in the fields, such as fire fighting ...