DIG Corporation PC Dripline, 250' Brown, 12" Spacing, 17 mm, 1 GPH , with Check Valve The drip line is use our 17 mm barbs or .700 OD compression fittings Resistant to chemicals and fertilizers commonly used in landscaping The PC Drip Line with 1 GPH emitters every 12 spacing is used for commercial, and residential applications. Flow regulated, self flushing inline emitters deliver equal flow at a wide range of operating pressures