This ? polyethylene Dripperline (.250 OD x .170 ID) with UV inhibitors has ? GPH emitters spaced every 12. ? Dripperline can be wound throughout flower beds or borders, wrapped around trees or shrubs, run down rows in a vegetables garden, or can be used in container planting. Use with ? barbed fittings. Terminate the end of Dripperline with a goof plug. Dripperline is easily attached to the ?’ poly hose supply line with a ?’ barbed coupling, tee or elbow. The maximum recommended operating pressure should not exceed 25 PSI, and the maximum line length should not exceed 20 in length!