Midline Valve Needle Valves are Produced Out of High-Quality Lead-Free Brass Which is Safe for Use with Portable Water, Instrumentation, Hydraulic and Pneumatic Systems. These Valves are Used in Flow Metering Applications Where a Constant Calibrated or Low Flow Rate Should Be Maintained for Some Time. E.G., Idle Fuel Flow in a Carburetor. They Are Also Commonly Used to Provide Shutoff for a Pressure Gauge. This Valve Features a Needle Shaped Handle Which Makes It Easy to Shut Off Even When the Pressures are High.