An image forming apparatus including an electrophotographic photoconductive member, a charging unit, a delivery unit and a cleaning unit. This driving circuit comprises an analog buffer circuit outputting a signal responsive to the potential of input data while supplying the data to a data line and a buffer control circuit for substantially stopping the analog buffer circuit when not supplying the data to the data line. The frame sections are preferably C-shaped when viewed from the side. During installation in a sealing apparatus, a heated mandrel engages the inner diameter of the spout aperture thereby pre-heating and physically supporting the fitment during the installation process.