Aurelema Drip Irrigation Pressure Regulator And Filter 25 PSI Water Backflow Preventer For 3/4'' Garden/Faucet Hose Thread And Drip Irrigation Inline Y Filter 3/4 X 3/4 FHT Hose Connection (2

Please note: Irrigation pressure regulators need outflow and back pressure to regulate the pressure within your irrigation system. With no water flowing through the regulator, the inlet and outlet pressures will measure the same. To verify the pressure maintained in your system, you will need to place a pressure gauge at the end of one of the zones. Turn the zone on, let it pressurize, and once the lines have filled and emitters begin to flow then take the reading. This will reflect the working pressure within your system. Regulates the pressure within the drip irrigation system. Choose the appropriate preset PSI rating for your application (normally 25 PSI for poly tubing and 10 PSI for drip tape). The pressure regulator shall maintain the predetermined operating pressure provided the inlet pressure is at least 5 PSI above the expected outlet pressure, but must not exceed the maximum inlet pressure rating. Always install pressure regulators downstream from all shut-off valves. The arrow on the housing shows the direction of the flow and should always point downstream toward emitters. Features:Low hysteresis and friction lossCan be Installed above or below groundLarge flow path resists pluggingNo external metal parts to corrode Special note: This pressure regulator is not designed to operate under static (constant) pressure. It must be installed after any valves or timers to operate correctly. It also helps conserve water and energy and extend sprinkler and drip system life in your garden or nursery. Works with any standard 3/4 outdoor faucet, hose bib, garden hose, water hose, sprinkler manifold, garden soaker hose or home irrigation system. Made in the USA of engineering-grade thermoplastics. No external metal parts for excellent corrosion resistance. Important note: This irrigation pressure regulator regulates dynamic water pressure (the pressure while water is flowing). If measuring this regulator with a pressure gauge, do not screw the gauge directly onto the end of the regulator. This blocks the flow of water and measures static pressure, not dynamic pressure. To measure dynamic water pressure, attach a gauge at the end of your irrigation tubing line, or use an inline gauge that allows water to flow unblocked through the regulator.