Shut off the air compressor if it is running.
Insert the bullet-shaped end of the hose adapter into the nozzle on the air compressor and twist clockwise 1/2 turn to lock the adapter on the compressor.
Insert the male end of the garden connector into the other end of the adapter attached to the air compressor. Twist the connector counterclockwise to fasten it to the adapter in the same way you would attach a garden hose to an outdoor faucet.
Hook up the other end of the garden connector to a watering hose or the main line on a sprinkler system and tighten.