Join Date: May 2012
Location: Southern California
Ua, I have changed that exact gasket on my thermofilter pro 2 twice over the 10+ plus years I have had it. I bought two though this last time just to have a back up, which I ended up needing as the first o-ring got pinched on the reinstall and leaked. One thing I found on the second try was that it was much easier to push the pump head out the bottom, install the o-ring and then slide back up while carefully avoiding the pinch point. Pushing it out the top and then back in made it bind and pinch the o-ring more. Use lots of gasket grease to.
Any questions feel free to hit me up.
The way the describe it in the link you posted is exactly the way that I found was best.