Check the listing for details. Irritec iDrop Button Dripper. Condition: New. Listed at 9.67 USD. The iDrop non pressure compensating dripper with turbulent flow technology is a great choice for greenhouses and nurseries or landscapes where you desire precision flow rates in a predominately level area. However, as with all non pressure compensating emitters the flow rate will vary according to the operating pressure in your system. The turbulent flow technology reduces clogging and sedimentation issues. This non pressure compensating dripper has a barbed inlet for inserting into 1/4" (.170" ID x .250" OD) micro tubing or directly into 1/2" or larger poly tubing by punching a hole into the tubing with any 1/4" hole punch and then inserting the dripper.Features: Color coded base for easy flow rate identification; Optimal operating pressure: 15 PSI; Highly resistant to fertilizers and common chemicals used in agriculture industry; Flow Rates at various operating pressures:Flow Rate 5 PSI10 PSI 15 PSI20 PSI25 PSI30 PSI35 PSI40 PSI45 PSI50 PSI0.5 GPH.32.44.53.60.67.73.79.84.89.931.0 GPH.65.881.071.221.361.491.611.721.821.912.0 GPH1.281.732.132.452.732.983.223.443.643.86