The Omnipure K-Series K5528-BB inline filter is a GAC carbon block. This filter has 1/4 FPT fittings. Tis can be used as a post R.O. filter. It can also be used in ice makers, refrigerators, beverage equipment, drinking fountains, under the counter systems, R.O. systems and in conjunction with purification systems. This filter aids in the removal of taste, odor and chlorine taste and odor.Dimensions: 2.5" W X 10" LFlow Rate: .5 GPMMaximum Pressure: 125 PSIGMaximum Temperature: 100 FService Life: 1 Year or 2000 GallonsFiltration Media: Granulated Activated CarbonVolume Cubic Inch: 28.6Fitting Size: 1/4" FPTOmnipure K5528-BB has been tested for performance under NSF Standard 42.