TSE Brakes offers a factory-sealed diaphragm on a Variable Clocking Technology (VCT) Complete Unit. To use, loosen one bolt and spin the housing in a clockwise direction for easy installation. The 180-degree clock rotation eliminates need for stocking both left- and right-hand units. Six part numbers handle most applications. With the diaphragm being factory sealed, the installer is no longer responsible to get the best possible seal. VCT models are available on UltraLife and OmniBrake air brake actuator models.