Can't help without a picture but my crusader have 1 read for draining hot water side. Next to it is a white line to drain cold water side. Additional white line under the front basement. All have valves. White is usually cold water. My previous rig had an open end for overflow when filling fresh water tank.
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2013 Prime Time Crusader 330MKS
2018 Chevy 2500 D/A Z71 4x4 Offroad
2006 Holiday Rambler Savoy 33SKT-40,000 trouble free miles-retired
2006 Chevy 2500 D/A-retired
2013 Chevy 2500 D/A-retired