Hrph 20m DIY Micro Drip Irrigation System Plant Self Watering Garden Hose Kits Material: plastic Connection: Approx. 1/4'' hose Inner diameter: Approx. 4mm; Outer Diameter: Approx. 7mm 8 spray hole and can adjust water flow rate, also for cutting off the water flow Great for agriculture, lawn, garden sprinkler irrigation drip