The Pin Perfect Nozzle is excellent for overhead watering. The pipe, preferably PVC, can be threaded to take the nozzle. An even easier method of installation can be done by drilling a 7/16� hole in the PVC or steel pipe. An assembly insert is pushed in the hole and the nozzle is then screwed in causing the insert to spread and completely seal off any leaks. Space nozzles 4�-5� apart.