Zehnder ComfoTube 90mm diameter, mmanifold/grille housing spigot reducer, 90mm diamater to 75mm diameter

ComfoTube 90mm to ComfoTube 75mm convertor.  This rigid connector can be placed into a ComfoTube 90mm manifold or grille housing spigot to convert it to 75mm.  It comes complete with locking slides and o-rings and is ideal for use with the CSB-P housing.  50mm long, 90.1mm diameter.