A FPE valve is a type of valve used in plumbing systems to control the flow of water. It is designed to prevent the flow of water in one direction while allowing it to flow in the other direction. The valve is usually made of brass or plastic and is installed in the water line to regulate the flow of water. FPE valves are commonly used in residential and commercial plumbing systems to regulate the pressure of the water and to prevent backflow. They are also used in industrial applications to regulate the flow of liquids and gases. FPE valves are designed to be reliable and durable, and they can be used in a variety of applications. They are also easy to install and maintain, making them a popular choice for many plumbing systems.