The Omnipure K-Series K5655-SS-NRW37 inline filter features 1/4" OD 90° Quick Connect on both ends. This filter features an ion exchange process producing deionized water which is water that lacks ions, such as those from sodium, calcium, iron, and copper. Additional Details ------------------------------ Product description: The Omnipure K-Series K5655-SS-NRW37 inline filter features 1/4" OD 90° Quick Connect on both ends. This filter features an ion exchange process producing deionized water which is water that lacks ions, such as those from sodium, calcium, iron, and copper.