Flow Control Valves in the Plumbing category from GoVets are the perfect solution for completing or working on your project. Plumbing Needle Valves are a type of Flow Control Valve that is used to regulate the flow of liquids or gases. They are designed with a long, tapered needle that is used to adjust the flow rate. Needle Valves are ideal for applications that require precise flow control. Shop today to find the perfect Flow Control Valve for your project.