125 diameter - the 90° Tee is usually installed when you are connecting the flue to the rear outlet of an appliance, a tee cap is include for the base of the tee to allow sweeping access
90 degree tee and cap - matt black.
VIT-Smooth pipe should only be used as a connecting pipe between your appliance and Flue Liner / Chimney Stack / Twin Wall Flue System.
VIT-Smooth pipe should NOT be used to pass through ceilings or combustible walls.