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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. 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. Maximum operating pressure: 2000 psi at ambient temperature (70 degree F). Exclusive color coded reference scale on the adjusting knob greatly simplifies flow setting, resetting, adjusting and return to an original flow. 3/4" Thread size.