This Hy-lok valve fitting is designed for use with 1/4" tubes and can withstand a maximum pressure of 6000 PSI. It is a reliable choice for use in various industrial applications. The brand name Hy-lok is known for its high-quality products, which are designed to provide optimal performance and durability. This valve fitting is suitable for use with needles valves and is a crucial component for any plumbing or piping system. It is easy to install and use, and is a great addition to any toolkit for industrial applications.