Needle Valve used to provide flow control and shut-off in either direction. Zinc plated adjustment knob allows for precise valve setting. Set screw allows handle to be locked in place. Heavy Duty Construction. Carbon Steel body with black oxide finish.. Opening Pressure: 7.25 PSI. Max Flow Rating: 22.5 GPM (85 L/Min). Max Flow: 22.45 GPM (85 l/m). Max Pressure Rating: 5000 PSI. Buna N O-Ring Seals.