The actuators in the RVAZ4 product family are recommended for use with Regin's ZTV / ZTR and ZTVB / ZTRB valve series. The RVAZ4L1 Series Actuators must be used with the Regin MVFL Valve Series. They are easy to install and have an easy-to-read position indicator that shows the position of the actuator. The actuator can also be operated manually.