Spray nozzle with hollow-circular pattern atomizes fluid and sprays away from the nozzle in all directions. Suited for applications such as cooling, humidification or dust suppression, the nozzles provide a smooth, even coating on the inside diameter of a pipe or similar ductwork. They provide liquid flows from 1.6 to 14.7 gal/hr with liquids up to 300 cP. The no-drip valve assembly stops liquid flow when air pressure is shut off. The stainless steel nozzles, in 0.125, 0.25 and 0.5” NPT, can be used with water, light oils, chemicals, rust inhibitors, paints and dyes.