High Pressure 3/16" Threaded Outdoor Anti-drip Fogging Spray Head Misting System Nozzle, Orifice 0.3mm 10-pack It only uses one half gallon per hour per nozzle. Thread size: 4mm(diameter)*5mm(length) , 3/16" pitch. Note : this is a high Pressure mist nozzle , the Pressure is 20-80kg/cm features a sturdy brass body with stainless steel orifice Soaking periodically in misting nozzle cleaner to remove mineral deposits that may accumulate with usage A Filter on your mist system