Installed a new 5th stage filter in December, today on February 5th the 5th stage fitting popped out and luckily I was standing right next to it. The original 5th stage was a screw type and the first set of replacement filters were the same. The one I received in December had a new fitting that went into the filter. If it was somehow included in the filter or pre-installed by the manufacturer, then it wouldn't be any better. Do not purchase this product if it has not learned this lesson after getting wet. If you bought these and just want to sort it out, I used lots of tape on both ends to make sure it doesn't pop back out.
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