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Omnipure Q5605, (2) Q5633, and Membrane Replacement Sediment Carbon Filter Cartridge Set w/ 50 GPD Membrane for Purotwist 4000 plus Small and Large Head O-Rings by IPW Industries Inc.
Complete set of Omnipure Filters for Purotwist 4000. Set include Q5605, Q5633, Q5633, and 4x Small and 4x large O-rings included. O-rings are recommended to be replaced ever year. Dimensions 12.64 x 10.31 x 2.64 inches, Weight 4.62 pounds, model number Q5605, Rank Tools & Home Improvement Replacement Under-Sink Water Filters 2242, Available November 

Price is $146.00
Price: $146