Manufacturer Name: Siemens Building Technology Product Number: 257-02045 OEM Part Number: 257-02045 Product Description: 3/4"Fxum No 3-8 Linear2"Act6.3 Weight:1.84lbs/834.61g Siemens 257-02045 is a high performance 2" pneumatic actuator for efficient and reliable valve control in HVAC systems. Because this is specifically engineered as a 2 way valve, it can be used in ... https://www.partshnc.com/34fxum-no-3-8-linear2act63