The 2-pk Sub Zero Water Filter 4204490 is a white plastic water filter made by ZeroWater specifically for Sub-zero refrigerators. It uses carbon/charcoal filtration method to remove chlorine taste and odor, ensuring clean and fresh water. This replacement cartridge is designed to fit seamlessly into your Sub-zero refrigerator, providing you with a convenient and reliable solution for your water purification needs. Made in China, this filter is a high-quality product that will help you maintain clean and safe water for your household.