I'm a fairly new boat owner two years to be exact I'm learning as I go along,lately I noticed I'm taking in water and using my bilge pump to take it out.My question is at drain hole of the hull should there be a plastic gasket or rubber gasket in that tube?The drain plug fits perfect but I think there was some type of gasket there before,could that missing gasket cause me to take in water even though drain plug fits securely?Thanks guys!!