Brass/Stainless Mist Nozzles have a 10/24 thread with a .012 (twelve thousandths) orifice. It is a three piece nozzle with a brass body and a stainless steel orifice and a stainless steel cylinder within the nozzle. It should last for 2 - 3 years with proper maintenance. The nozzle will have a cone shape spray pattern of approximately 75 degrees (at 70 p.s.i.) and should obtain complete evaporation when mounted at least 8 feet off the ground (This assuming 95 + degrees with 0% - 20% humidity). The nozzles themselves have been tested between 45 and 1000 psi. Nozzles require a minimum of 25 psi. This nozzle will emit approximately .460 gallons per hour at 60 p.s.i., 0.720 gallons per hour at 150 p.s.i., 1.60 gallons per hour at 1000 p.s.i.