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【Pocket Mode】 for injecting smoke into large openings. Insert the deflated bladder and inflate with the built-in hand pump. Plug mode: to block smoke. Tuck the inlet hose to the back of the bladder to crimp it and block the bladder by turning it into an inflatable plug. 【Wind/Water Leakage Mode】 to test door jambs for leakage. How to: Max A/C Fan Fan Turn off traffic. Close all doors and increase positive air pressure inside the cabin. Air escapes naturally through leaks in the door pillars. Let the smoke flow through the universal bladder for a slow and steady stream of thick smoke. Guide it through your door uprights until you see turbulent air blowing the rising smoke. Emergency bladder: additional bladder included Carbon Nitrile: Industrial and Automotive Grade