Example aspects of a tight-seal piping component, a tight-seal piping assembly, and a method for preventing leaking in a piping assembly are disclosed. The tight-seal piping component can comprise a fitting body defining a fitting inner surface, a fitting outer surface opposite the fitting inner surface, a first fitting end, and a second fitting end opposite the first fitting end, the fitting inner surface defining: an interior channel defining a fitting axis; a seal stop surface within the interior channel; and internal threading between first fitting end and the seal stop surface, the internal threading defining straight threading extending in a direction about perpendicular to the fitting axis; and a seal received within interior channel and abutting seal stop surface.