Abstract: Pipeline passage indicators for signaling the presence of a pig in a pipeline are disclosed. A pipeline passage indicator may house an upper magnet and a lower magnet in separate bores within the pipeline passage indicator. A flag attached to an upper end of the pipeline passage indicator is moveable from a first position to a second position in response to upward movement of the upper magnet. A labyrinth member defining a circuitous flow path is moveable from a first position to a second position in response to movement of a trigger from a first position to a second position. Movement of the labyrinth member will cause the lower magnet to move from its first position to its second position, which will cause the upper magnet to move from its first position to its second position and thereby move the flag from its first position to its second position.