Simply put, air chucks are valve accessories that attach to your tire valve stem for tire inflation and maintenance. They allow air to flow in and out of the tire to help monitor and maintain proper inflation. Air chucks are often sold as accessories for tire pressure gauges, inflators, or air compressor hoses.
"Closed flow" air clamps are used for direct connection to air compressor hoses. These types of chucks only allow air from the compressor to enter the tire if they are attached to the tire valve stem. These are ideal if you want to connect the air chuck directly to the air hose without monitoring tire pressure in any way. Closed flow air chucks cannot be used with tire inflation pressure gauges or other stand-alone tire pressure gauges.
"Open flow" means that as long as the air compressor is running, the air chuck will continuously let the air flow through. This is a more modern and ideal way to use an air chuck, as it allows for use with a tire filling gauge, which allows you to monitor tire pressure as you fill it. This makes the open-flow chuck easier to use because you don't need to remove the air chuck from the tire valve stem before double-checking the tire pressure with a separate pressure gauge during inflation. That said, open flow is best using a chuck when set up with a tire pressure gauge or a standalone tire pressure gauge to keep the tire inflated. In this case, the inflation pressure gauge (or regular tire pressure gauge) will act as a device to control the flow of air from the compressor into the tire.
Although you can connect them directly to the air compressor hose, it will remove any control you have over the airflow from the compressor. So it is recommended that you connect a compatible tire pressure gauge to your air compressor hose first. You can then attach an open-air chuck to the tire air gauge's air hose for maximum control during inflation.
Ningbo Sinppa Air Tools Factory is a Chinese manufacturer of pneumatic tools. The company mainly produces and sells Pu Air Hose, Air Duster Gun, and other types of tools.