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The ICON HT630ED is a rotomolded polyethylene holding tank sized at 18-1/2" x 22-1/2" x 6" with an 8-gallon capacity, built for left-end or bottom-drain configurations. The 3" drain fitting comes preinstalled, so you're not sourcing and fitting a spigot separately.
Four level sensors are also preinstalled, giving you tank monitoring right out of the box for use with a compatible RV monitor panel.
Confirm your rough tank cavity dimensions and drain location match before ordering, since holding tanks are highly application-specific.