ISPRING HC12X2 Transparent Water Filter Housings 10-Inch RO / Aquarium, 2-Pack Good for Reverse Osmosis Water Filter, Whole House Water Filter and RO DI Filter Fits 10"x2.5 standard filter cartridges, compatible to most RO systems, includes Watts Premier, Flowmatic, PuROLine, Crystal Quest, Apec and etc 1/4" Inlet/Outlet Made of 100% high-quality polypropylene Transparent housing makes it easy to judge the filter status