Socket tool for servicing fluid connectors. In one embodiment, a tool includes a body having a hollow recess at one end. The hollow recess has non-circular dimensions for rotating a head fitting of the fluid connector about an axis. The tool further includes a pin that mounts to a surface inside the hollow recess so that the pin is disposed in an axial direction along a center of the axis. The pin enters an aligned opening of a nozzle of the fluid connector and occupies a conduit space in the nozzle when the hollow recess is engaged with the head fitting of the fluid connector.