Doesn't fit my 1" flow filters. My filter housing is about 8 years old. There must have been a design change and they no longer fit in the case. They should have an install instruction if they stop working on devices that aren't really that old. Difa is not visible in the pictures on Revain. It's only when they're close that you see the difference. The replacement filters are approximately 1/8 longer and have a narrower diameter of the filter drum where the ends need to seal in the housing. I was able to use teflon tape and create a sealing area around the o-ring to get it working, although unfiltered water will likely seep through this unit. Buy 2 and return one. I hope this helps you with your purchase decision. Jim
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