The insecticide nozzle tips are manufactured from high quality brass (filter) and stainless steel. The nozzle tip has a built in check valve and filtering system. The check valve gives a very positive spray on and spray off. The filter is designed to take out any particles that could interfere with the flow of the insecticide. The nozzle tips used in our Shoo-fly automatic flying insect and fly control systems safely and efficiently dispense Shoo-fly insecticides killing mosquitoes, flies and other flying insects using safe, water emulsifiable insecticides.