The Kunkle safety relief valve is a new old stock item that does not come with its original box. This valve is suitable for use with air as the media, and it is made of brass with a maximum adjustable pressure of 150 psi. With an inlet diameter of 1/2 inch and an outlet diameter of 3/4 inch, this relief valve is designed to provide a reliable and efficient solution for controlling pressure in various industrial and hydraulic systems.