I am sorry to say this gasket isn't so reliable as I had hoped. My first kept tight but snapped after 3 fermentations. The new one is a bit uneven and doesn't keep tight. I have tightened the clamp seal quite hard. I also would like to see a one-piece solution also a bit softer in order to keep tight.
This is my second conical gasket. The first lasted about a year, with approximately two brews per month. The gasket appears to be joined by glue, which is where it will fail. I'd like to see a one-piece design in the future.