a hand - held apparatus is provided to allow a user to easily apply the necessary force required to install or remove caps into or from a vial or test tube . the device includes a handle member that is ergonomically shaped to provide a user with maximum comfort and control of a cap while applying pressure to insert caps . the device also includes a coupling portion configured to selectively engage a cap and efficiently disengage a cap . through this configuration , a user generated force is transferred from the handle member through the coupling portion , and to the cap , thereby causing the cap into an opening of the vial for locking the cap into a sealed and closed position with the vial .