DIG Corporation Drip Line 500', 6" Emitter Spacing, 1/4" .52 GPH, Color : Black - Drip Irrigation Tubing (.170 ID x 240 OD) Use 1/4" barb fittings Resistant to chemicals and fertilizers commonly used in landscaping Flexible tubing for easy installation Flow regulated, self flushing inline emitters deliver equal flow at a wide range of operating pressures