Abstract: A fluid flow indicator for use with light transmitting conduits having end fittings which include a bore. The flow indicator includes a base defined by a coiled wire closely received within the fitting bore and an axially extending indicator support which extends from the base into the conduit includes a rotatable flag whose rotation can be exteriorly observed or sensed as fluid flow occurs. The coiled wire base includes an abutment engaging with fitting structure for axially positioning the indicator relative to the fitting and conduit.