Rain Bird XFSP 09 18 500 Sub Surface Purple Dripline with Copper Shield Technology 0.9 GPH, 18" Spacing, 500 ft. Coil F43100 telling you when to clean telling you when to clean the filter Rear access screw terminals available (Model "K") Category Hour MeterWeb Digits Coloring (Hours) White on Black Digits Coloring (Tenths) Yellow on Black Environmental Rating IP54 (With Use of Gasket) Gasket Model G 55U (sold separately) Hour Meter Material Plastic RoHS Certification Yes Operating Temperature Max (°C) 72 Operating Temperature Max (°F) 160 Operating Temperature Min (°C) 40 Operating Temperature Min (°F) 40 Product Depth (in) 2 low maintenance sub surface drip irrigation system for use under turf grass or shrub and groundcover areas Extra Flexible