This TeeJet Tip Strainer 100 Mesh with 5PSI Check Valve 4 Pack is designed to prevent spray tips from clogging and to ensure a consistent, uniform spray pattern. The 100-mesh stainless steel screen effectively filters out small particles, while the 5PSI check valve prevents dripping and provides a crisp on/off action at the boom. The check valve also helps to maintain consistent pressure throughout the boom, leading to better spray application. This strainer is compatible with a variety of TeeJet nozzles and is easy to install and replace. The pack of four provides a convenient and cost-effective way to maintain your spraying equipment. It is ideal for a wide range of agricultural and industrial spraying applications, including herbicides, insecticides, and fertilizers.