A Gravity-fed Watering System Offering The Benefits Of Drip Watering At A Low Price.as The Kit Is A Selfcontained System, It Is ideal to be used In Areas Where There Is No Mains Water Supply. Simply Fit Above The Plants To Be Watered & Let Gravity Do The Rest.the Reservoir Will Drain Over 24 Hours (depending On Flow Rate Of Each Dripper) Which Will Ensure Plants Are Sufficiently Watered For A Two Day Period – Ideal If You Are Away For The Weekend. The Water Reservoir Bag & Tubing Are Made From Recycled Pvc & The Drippers From Polycarbonate.the Kit Contains --a 10.5 Litre (2 Gallon) Reservoir Bag, 19.6ft/6m Of Black Irrigation Tube, 8 Adjustable ‘drippers’ & A Hardware Kit.-will Drip Water For Up To 24 Hours Or So-perfect For The Slow, Steady Watering Of Your Grow-bags