Put a pail underneath the drain and run one of the sink taps ...pull one valve and see if water comes out...if not , pull the other one . Once figured out put silver paint or nail polish in the handle of the grey valve.
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It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..(just sold it)
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper
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