If you are referring to the plastic plugs that are in the cold water supply (blue) and hot water output (red) lines, they are only there to keep any debris out of the lines before connecting, so pull them out and toss them.
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If you are referring to the plastic plugs that are in the cold water supply (blue) and hot water output (red) lines, they are only there to keep any debris out of the lines before connecting, so pull them out and toss them.