SUB-ZERO-compatible 7023811 Refrigerator Water Filter Replacement Cartridge Up to 3 available NEW filters for purchase–2 Sealed boxes, 1 unsealed box Recommended to change filter once per year. Separate listing [Item 5179438151720] for essentially new test cartridge used for 5 seconds, then removed [wrong model]. *Seller is not a retailer. Retailers subject to SubZero pricing sell for approx. $59/unit.