Stainless Steel restriction orifice plate is a device used to restrict flow. It reduces flow and pressure from the upstream side to the downstream side. 

• To determine GPM: GPA x MPH x W / 5940 (Example: 10 gallons per acre x 6 Miles Per Hour x 15" nozzle spacing equals 900 when divide 900 by 5940 gives you .16 gallons per minute)
• W = Nozzle spacing (in inches) for broadcast spraying, Spray width (in inches) for single nozzle spraying, or Row spacing (in inches) divided by the number of nozzles per row for directed spraying

Note: Always insert orifice plate with side marked with number facing the outlet.