Boost your Mack, Volvo -  engine's capabilities with this actuator, specifically designed for Turbocharger model(s) HE400VG, HE431VE, HE451VE, HE500VG, HE551VE The Actuator 21754439 is engineered to provide outstanding performance in critical automotive applications. Its advanced design ensures smooth operation and precise control, making it ideal for systems requiring accurate positioning. Constructed from durable materials, this actuator is built to last, even in demanding environments. With straightforward installation and broad compatibility, the 21754439 actuator is a trusted choice for enhancing your vehicle's performance and efficiency.