Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, and inexpensive.

Check valves work automatically and most are not controlled by a person or any external control. Accordingly, most do not have any valve handle or stem. The body's external shells of most check valves are made of plastic or metal. The main purpose of a check valve in a system is to prevent backflow, which could damage equipment or contaminate media upstream. For additional information regarding the product, please contact the dubby support team.