The Red’s Hydraulics Hydraulic In-Line Adjustable Variable Flow Control Valve w/ Free Reverse Flow, 3/8″ NPT works great on any lowrider hydraulic system. The valve is used to provide flow control and shut-off in one direction with free reverse flow in the opposite direction. Precision control allows you to provide the exact amount of flow you need to for the hydraulic system. Rotate the handle to the exact flow setting you need.Our flow control valve assembly easily installs in-line for convenience and easy access for the user.