They hold pressure which was a problem with the PTFE strainers I replaced with these. They are of low quality. There are pieces of plastic in one of the screens. It looks like they want to scrape off the excess and poke a hole in it. A small hole but larger than the screen itself. There is a lot of excess liquid in the plastic seal. They are definitely more difficult to apply than others I've used. I have to slap everything together to get the clamp. But he perseveres.
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