I bought this filter set together with the filter. When it came time to change the filters for the first time, I found that the 5th stage replacement had quick disconnects while the original didn't. I couldn't find the fittings I needed in the original kit. I contacted support and within a day got a call from Nick explaining that the filter sets come with quick disconnects and the required fittings are likely included in the box but may not be easy to find. I searched the box with the filter set and sure enough they were there. He was also happy to send the necessary accessories if they weren't in the box. Very happy with the filter system and even happier with the iSpring support!
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