This pressure relief valve from APOLLO is built to last, crafted with high-quality brass for optimal performance. It features an inlet diameter of 1/2 inch and is a reliable choice for any plumbing or industrial application. With its precise engineering and durable construction, it is sure to meet all of your needs. The APOLLO 19KDCA100BA pressure relief valve is an essential component for any hydraulic or pneumatic system. Its reliable performance and solid construction make it an ideal choice for businesses and individuals alike. Whether you are looking for a valve for your industrial operation or simply need a reliable component for your plumbing system, this valve is an excellent choice.