Trigger sprayer is a tool for spraying liquids. It generally includes a main body (also called "gun body" or other names), on which parts such as a nozzle, a piston chamber, a straw, and a wrench are installed to realize the spraying function. . In order to prevent dust, protect internal components, etc., a cover (or "shell", "protective shell", etc.) is generally installed outside the main body. In order to facilitate assembly and maintenance, the The cover is installed on the main body through detachable installation methods, such as sliding buckles, buckles and so on.