If it's an "extension" you might think you could buy it to connect to the filter part, but there's no way to connect that because you need exactly that. the same width as the pipe you have. You need to buy a fastener and this was not written in the product description. I should have read the reviews because a lot of people complain about it. Also, it didn't come in a box, just a small envelope without much protection, so it's lucky it wasn't torn.
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