The UKF7003 model filter is available in 4 brands. The original model OEM is manufactured by Maytag and the three other aftermarket brands include EcoAqua, Supco, and Swift Green. This filter model is compatible with multiple systems. The UKF7003 model can be utilized in the Pur filter system, Maytag refrigerators, and Jenn-Air refrigerators. The factory original OEM UKF7003 by Maytag has been put through critical testing procedures by NSF International, an independent testing organization dedicated to ensure both public and environmental health. The NSF declared the UKF7003 model OEM met International standards for both Standard 42 and Standard 53. This grading ensures a quality water product after filtration ensues; decreasing chlorine, decreasing contaminants, dirt, and other potentially harmful materials found in your water supply.