My 1981 Catalina 30 bilge pump will pump up to the fitting at the port lazarette bulkhead. Through this plywood bulkhead I lose the routing of this hose. Is this plywood removable and will I gain access to the thru-hull if removed. I feel there is a restriction beyond this point. As always, thanks for any input you may have. Ray Lewis S/V Catharine, upper Chesapeke Bay.