Very good fitment. It was easy to install with the help of a friend with the right plumbing tools. However, the product description is wrong, this installation does not use the 20x2.5 inch filter! They use 4.5 inch filters. I can't believe nobody has pointed this out yet. Helpful Hint: Install shut-off valves on both sides of the filter during installation. prevent all the water from draining out of the house while you change filters. With shut-off valves, changing filters becomes much easier.
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