iSpring HW12X2 Slimline Water Filter Housings, 10-inch, RO/Aquarium, 2 Pack Good for Reverse Osmosis 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 Dimensions: 4 3/4" O.D. X 12" H