Put new valve in and tried gently pry tab but nothing would budge. I have no idea how you were able to do this. If you have time, please post a video? Could help a lot of members out.
Ok, before you laugh at the video, you must consider these factors. I’m old, shaky and try doing this looking at your phone screen and not the actual valve.
1. Turn the valve so the tab is inbetween the end stops.
2. Put downward pressure on the valve with your thumb of same hand holding valve.
3. Insert tool of choice between the tab and outer lip of valve casing. Mine was a butter knife, but a thin screwdriver is much easier as you can just insert, then twist to apply steady pressure to tab. My screwdriver is in the garage and it’s colder than a well diggers *$$ out there. Hence the butter knife. Lol!
4. Do not look through your phone screen and try to use a butter knife while making a video. It almost proved how redneck I am. (Or it did.)
5. Fixing video link, give me a few. It’s broken.
FluvalAquastopFix