The Omnipure K-Series K5655-JJ has 1/4 quick connect fittings that make this filter really easy to install and remove. This filter also has a ion exchange process producing deionized water which is water that lacks ions, such as those from sodium, calcium, iron, and copper. Dimensions: 2.5" W X 12" L Filtration Media: DI Mixed Bed Resin Fitting Size: 1/4" FQC Additional Details ------------------------------ Product description: The Omnipure K-Series K5655-JJ has 1/4 quick connect fittings that make this filter really easy to install and remove. This filter also has a ion exchange process producing deionized water which is water that lacks ions, such as those from sodium, calcium, iron, and copper. Dimensions: 2.5" W X 12" L Filtration Media: DI Mixed Bed Resin Fitting Size: 1/4" FQC