I received these and immediately opened them up to check the o-rings as I saw others had problems. They are neat as they should be and everything looked good in them. I installed one of these and it fits perfectly even with the same physical size as the original. I recommend applying a very thin coat of petroleum jelly around the o-rings before installation to prevent them from binding or curling. This also makes it easier to reinsert the filter. They even sent a sheet of stickers so you can have a better idea of when they need replacing.
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