Abstract: A marking means for a hose coupling expansion attachment machine automatically provides desired markings on the female hose coupled simultaneously with attaching it to a particular hose section. The marking means which is mounted on the front of the machine adjacent to the expanding means is in marking alignment with the curved periphery of the rotatable female external end section of a hose coupling. The marking means is linearly moveable between a nonmarking position and a marking engagement position so that as the marking means passes into and through the marking position, the female and section will be rotated to provide the desired marking on the curved periphery of the female end section. Rigid hollow circular cylindrical stamp arbors are utilized to prevent deformation of the hose couplings, and two or more expanding means stations can be utilized for either male or female couplings, or both, with only the female couplings being marked.