Coupling, is a groove type pipe card, mainly used in dairy products, beer, food, beverage, pharmaceutical, biological engineering and other industrial fields.

Quick connector is a connector that can connect or disconnect pipelines without tools. The quick joint can be divided into: quick joint with air, quick joint with oxygen fuel gas, quick joint with gas liquid sharing, quick joint with oil pressure, quick joint with inert gas, quick joint with cooling water temperature oil, quick joint with semiconductor.