10pcs/carton for Portable Car Tire Inflator Pump 12V Heavy Duty Air Compresso step 1:Pull out the air hose, make sure the nozzle lever is in the up position. step 2:Place the nozzle over the valve stem of the tyre or other item you need to inflate. step 3:Lock the nozzle to the vale stem by pressing down on the lever. step 4:Switch the compressor/spotlight switch to the COMPRESSOR position to turn the compressor on.