Which generation of HRV Valve do I have

The original HRV valves was launched in 2007 and is easily identified by 8 screws holding the lid in place and a lever assembly under the solenoid

In 2020 the HRV received a major update. The updated valve uses a diaphragm and solenoid shared with the HRP series. The screws were reduced to 4 and the lever assembly was removed.