TSE Brakes offers a factory-sealed diaphragm on a Variable Clocking Technology (VCT) piggyback. The Piggyback Kit comes in four pieces vs. competitors eight for up to 75 percent less installation time, according to the company. The 180-degree clock rotation eliminates need for stocking both left- and right-hand units. Four 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.