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Icon has a wide selection of RV waste holding tanks to choose from, including 6 drain styles and can be used for black and/or grey water. All tanks are available with a 3" spigot fitting and 4 level sensors installed. They are constructed of tough ABS plastic and ABS Polymer adhesive and fittings are available. All seams are solvent welded and have a 1¼” mounting flange. Waste holding tanks are required to be secured in accordance with NFPA 1192 Standard on Recreational Vehicles.