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This Icon tank is built as a single roto-molded piece rather than welded sections, which means no seams to eventually crack or seep. It's a fresh-water-only tank, so it's meant for the drinking water side of your system, not gray or black water.
Because the fittings are already molded in, replacing a cracked or leaking fresh water tank with this one is mostly a matter of matching up your existing hose and fitting sizes.