So my offshore has a washdown switch at the helm and a socket/ hose adapter the port side rear near the seat/ compartment. It also has a plastic handle looking piece under the 4 rod holders near the rear center livewell/ fish box . Nothing happens when I push the switch. The switch that operated the fish box pump works and it fills fine with water but the washdown Nothing. What am I doing wrong? Do I need to open the plastic valve or something? It seems pretty seized.