Conex Reducing Y by Prevost The Conex Reducing Y by Prevost branches one air line into two while reducing the outlet diameter, letting you route compressed air to a smaller-diameter section without adding extra fittings. Its Y shape keeps airflow smooth and helps limit the pressure loss that sharp junctions can cause. Designed for the Prevost Conex system, this reducing Y drops straight into runs assembled from aluminum air pipe and works alongside the rest of our Conex connectors for fast, sealed connections.