Zehnder TVA 75 comfoTube diffuser box is used for both supply and returns. It will acept up to two ComfoTube 75 or ComfoFlex tubes.
installation bracket is Included. Fits return diffusers STB1, STB2 and supply difuser KE 125 . Allows connection to all Zehnder ComfoTubes by means of locking slide. When only one tube is to be connected, block remaining open port with ComfoTube 90 Cap