3/8 Outer Diameter Push-In Plastic Union Check ValveThe 3 8 Outer Diameter Push In Plastic Union Check Valve is a one way valve designed to allow fluid or airflow in one direction while preventing backflow. Featuring a push in (P In) connection on both ends, this check valve provides quick and secure installation without the need for tools. It is commonly used in water filtration systems, pneumatic lines, and fluid handling applications. Specification Value TYPE Check Valve DESIGN One way flow control