I do it a bit differently, I save the trub and put the sealed jar in the 33F cooler for 3 days, usually the yeast will drop to the bottom and solidify and you just pour off the top without disturbing the yeast, timing is everything if you wait even 15 minutes after taking out of the cooler it might not work
if it works as expected you can just pour finished beer on top and save, that will seal it