... effective construction with stable air supply, small size.3. Waist Belt: Fasten with buckle, length adjustable.4. Fast tube connector: ... pressure safety device, easy to swich on and off.7. Back support/ Back frame: Carbon fiber material, flame resitance, strong and light, ... cylinder is less than 5.5+/-0.5Mpa.11. Cylinder belt: Rachet buckle construction, easure the cylinder is strongly fastened12. ...