Abstract: The invention relates to a combined funnel and cap member which can be attached to containers for receiving waste fluid such as fuel or lubricating oils. The cap member is pivotally attached to a funnel body and can be latched to the funnel body opposite the hinge mechanism. The hinge mechanism or the latch mechanism is constructed in such a manner as to permit the cap member to rise relative to the funnel body in the event of overpressures within the container so as to provide an emergency venting path for gases under pressure within the container. Once the overpressure condition has been relieved the cap member will return to its normally closed position under its own weight. The cap member can be unlatched from the funnel body and opened so that fluids may be introduced into the container therebelow.