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The ICON HT106SD is a 9-gallon holding tank measuring 27" x 21" x 6", built as a direct replacement for RVs and trailers with a matching tank footprint.
It comes with a 3" drain spigot and level sensors already installed, so there's less hardware to source and mount separately during a tank swap.
Confirm your existing tank's footprint and outlet position match before ordering, since holding tanks are rarely universal fit.