Abstract: A fluid coupling (10) for an engine is described. The coupling includes a housing (21) threaded (22) for connection to the engine with a rotatable conduit means (11) which allows connection of flexible cooling fluid hoses in sealed connection with the housing. The housing can be turned into a corresponding threaded opening in the engine, particularly one located in a position which allows restricted rotational movement of the conduit means. This coupling is particularly adapted for use on heavy diesel engines, but could be adapted to any size engine, such as gasoline or diesel, for application in motor vehicles and the like.