e-cowlboy replacement for zodiac nature2 express mineral cartridge w28175 w26775 vessel system w20176 w20171 w20086 w20080 in-ground & above-ground swimming pools up to 30,000 gallons new upgraded is up for auction in Patio, Lawn & Garden. This item is in As Is condition. Bid on this item at our Strongsville - Drake Rd location before the auction closes.