Parker Hannifin 034770099 is a 3/8-inch manual valve rated for 150 psi, engineered to provide reliable hands-on control of flow in fluid power circuits. It supports manual starting, stopping, or modulating of flow in low-to-moderate pressure fluid systems, making it a practical choice for maintenance lines, test setups, and instrumentation that require direct operator control. The model number 034770099 identifies this specific Parker valve, and the 3/8-inch size denotes its nominal port dimension.
