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If it was under the bathroom sink than that is the Vacuum Breaker/Back-Flow Preventer Valve for the Black Tank Flush system. They are known to leak and give you problems. You must have connected your water supply hose to the Black Tank Flush connection.
A lot of folks, me included, have removed them and just connected the two pipes together. You then should add a Back-Flow Preventer Valve to the black tank flush connection outside in the convenience panel. These valves can be found at most hardware stores, Lowes or Home Depot.
Hope this helps! I'm sure there will be some more folks along shortly that may provide even more info.
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