The Whirlpool 4396508, 4396510, and EveryDrop EDR5RDX1 3-pack refrigerator water filter compares to the RWF1020 Tier1 discount replacement water filter that fits that model. For up to six months after easy installation, this filter will provide maximum performance, filtering out up to 99% of impurities ranging from chlorine to lead. Order this refrigerator water filter from Tier1--comparable to the Whirlpool 4396508, 4396510, and EveryDrop EDR5RXD1--and get great tasting water for less! Orders place by 4pm CST ship same day!