What Is a Wedge Wire Nozzle? A wedge wire nozzle (also called a Johnson screen nozzle) is a filter element made of stainless steel V-shaped wire wrapped around a support rod. The design ensures: • Precise slot size for retaining resin beads • High open area for maximum flow rate https://www.johnsonwedgewire.com/news/specify-a-wedge-wire-nozzle-for-ion-exchange.html