I have ordered a new reverse osmosis housing with a knurled end cap. It fit perfectly and worked really well to tighten it up. However, I have a 20 year old reed case with a smooth end cap and it won't work for that. The other end fitted and worked perfectly for my sediment and charcoal filter housings. Just obviously rotate in the same plane as you so you don't kinda break it in half. True, this is not the most durable plastic, so you need to be careful. My 20 year old case-only key is also plastic, but it's much more durable and won't break even if you smash it with a hammer to break the case. I'm not sure it would be safe to do with this one. If you found this review helpful, please rate it accordingly. Many Thanks
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