The present invention may be utilized as a single station integrated with a standard form, fill and seal machine wherein at least two containers are conveyed along the machine simultaneously. The present invention is able to retrieve fitments from a source, apply the fitments to the containers, and seal the fitments to the container at a single station. The design of the present invention requires only minimal space on a form, fill and seal machine. In practicing the present invention, at least two anvils retrieve fitments from a source and then undergo offset rotation into the interior of two containers. The anvils, with the fitments attached, are then moved translationally to insert the fitments through incisions in the respective containers. Once the fitments are positioned therethrough the incision, sealers permanently attach the fitments to the containers. The anvil then reverses its translational motion with one of the anvils moving a greater distance than the other anvil thereby positioning the anvils for offset rotation out of the interior of the containers. By inserting and sealing fitments to containers at a single station, the present invention is able to substantially diminish any opportunities for the fitments becoming disengaged from the containers prior to sealing of the fitments to the container. Also, the offset rotation allows for a rotating anvils to be used for multiple container processing machines.