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Title: Unusable out of the box.
Review: My faucet required one of the included adaptors which fit the faucet nice and snug. However, the Brita unit itself does not fit its own adaptor. It will not tighten even minimally without the threads slipping. When tightened as much as possible without the threads slipping, the slightest bump or jiggle and even minimal water pressure detaches the unit from the faucet.
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