The Hydro Flow® Poly Dripper Lines are used as feed lines from the distribution poly tubing line. These dripper lines are used to connect Hydro Flow® Blue or Black Dripper Stakes (#747196, 742415, 747198 or 742420). The Hydro Flow® Poly Dripper Lines may be installed above or below ground. The line has an inside dimension of 3/16 inch and the outside dimension is 1/4 inch at 15 inch of length. Sold in bags of 25 only.