Most likely that is a 2-way valve. One way it will take in the antifreeze and the other way it will take fresh tank or city water.
Could be you have to put a hose on the Antifreze port and in a jug, open the valve, and take in antifreeze when the pump runs.
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2019 Fleetwood Discovery LXE 40M w/2021 Equinox
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