S/N – T0874C707I have the standard (aluminum?) insert in the bilge drain hole area. Current;y using the standard 1″ brass and rubber plug to plug the hole. Is there an alternative to the standard plug that can be inserted inside the tube without removing it? Plastic, brass, or SS screw type with retainer? The ones Ive looked at and purchased (and returned) dont fit inside the tube. I really dont want to remove the factory installed insert, but would if necessary, and recommended.Any help would be appreciated.