A flush plug for a rough-in valve, wherein the flush plug is configured to be removably disposed in a rough-in valve chamber, and comprises an inlet/outlet pair defining a flow passageway, wherein when disposed in the rough-in valve chamber, in a first flush plug position, the flow passageway is configured to provide flow communication between a first fluid source and a first plumbing outlet, and in a second flush plug position, the flow passageway is configured to provide flow communication between a second fluid source and the first plumbing outlet; and wherein the first fluid source and the second fluid source are not in flow communication.