1/8" Hydroponic Drip Irrigation Tubing - 1000' Roll1 8" hydroponic drip tubing is the standard for drip irrigation, used to transport water or nutrient solution from a main tube or manifold to a plant site, usually terminating in a drip emitter. This size is normally used in growing commercial plants. 1 8" microtube has very specific uses and a limited flow rate. The distance this tube can run is limited to 5' if coming off a dripper and 10 ft if coming from a 1 2" or larger poly drip tube at 25 PSI.