I bought this product thinking it would be good quality because of the Dupont name. Well, it's not the greatest. The o-ring is difficult to seal properly, and sometimes it leaks a little even with a new o-ring. Today I wanted to change the filter and the key to remove the filter broke. I could probably use a strap wrench to remove the filter, but I'm afraid I might break the unit and then I'll have to replace it with something immediately. I'll try to find a better block that doesn't have these problems. I had one in my last house a year ago that I installed and has worked great for years without worrying about it leaking or not being able to replace the filter.
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