Attaching a fitting having a conduit in a port of a container. A sleeve forming a conduit has a flange adjacent one end and has a groove in an exterior wall. A gasket and a pressure plate is slidably positioned on the sleeve. A securing plate has threaded bolts therein and is slidably positioned on the sleeve to position one end of the bolts to engage the pressure plate. A securing element is positioned in the groove and disposed in the securing plate to prevent the securing plate from sliding off of the sleeve when the bolts are tightened against the pressure plate.