Dixon BFC800 Brass Flow Control Valve with Set Screw Lock, 1/2" NPT Female Series F Flow control valves provide precision flow control and full shutoff in one flow direction and automatically allow unrestricted free flow in the opposite direction Two-step needle provides fine adjustments at low flow with the first three turns of the adjusting knob; the next three turns give full-open needle position and conventional throttling control Maximum operating pressure: 2000 psi at ambient temperature (70 degree F) When flow is reversed, the heavy-duty poppet/retainer permits full-flow return capacity A simple set screw locks the valve on any desiRed Fiberglass setting