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ICON's HT610ED is built as a direct-fit replacement for RVs originally equipped with a left-end-drain holding tank of this size. The 3" spigot and four level sensors come preinstalled, so swapping out a cracked or leaking factory tank is mostly a matter of matching up the mounting points and reconnecting plumbing.
Confirm your existing tank's dimensions and drain location before ordering, since holding tank shapes and fitting positions vary by RV manufacturer.