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The types of air chucks are usually Closed Flow, Open Flow, Clip-on and Push-On, and Screw-On.
Most air chucks have a closed-flow design, this type blocks the flow of air until it is pressed or locked onto the valve stem. These are usually the best options for air compressors that have a tank because the compressor doesn't have to work to keep the tank full while you work.
Once connected to the airline, the open flow collet allows a continuous flow of air and is ideal for use with tankless compressors. This type of air chuck is gaining popularity as it is generally regarded as the most efficient type. Many are designed for use with tire pressure gauges.
The air collet is attached to the valve stem in several ways. Clip-on and push-on are the most commonly used designs. As the name suggests, pushing the air chuck requires you to push it down on the valve stem to start supplying air. Clip-on models work similarly but have a clip mechanism to hold them in place, reducing the risk of air leaks. The third type screws onto the stem. Screwing in place produces an excellent seal considering the clip-on chuck is very reliable, but is considered more trouble than it's worth
The sole purpose of the air chuck is to inflate the tire. They install on the stem and get to work. While it's a simple job, it's essential because a tire without air is nothing more than a chunk of rubber.
