i have 2 valves,,,gate valves but dont know where they go..... i had the boat hauled power washed and scrapped awhile back... there were no holes on the outside that led to the inside whic means no thru hull outlet....the valves go thru the hull inside but not thru the bottom that i could find....does anyone know what they could be for....this is an ericson 25....also the kitchen sink and ice box may drain into these valves havent tried putting water in the sink yet.....thanks in advance......chip