Aluminum Ball Jet Nozzle Air Diffuser Material: Aluminum Feature: easy to install and light weight Aluminum Ball Jet Nozzle Air DiffuserFeatures: This type of diffuser is specially designed to use in the application where the high airflow capacity and long throw supply syetems.airflow can be easily adjusted from a jet to a diffused pattern . Standard neck size have:100mm, 125mm, 160mm, 200mm, ...