Abstract: A fluid level indicating device comprises a transparent tube having a venturi section. A light-weight bead is disposed immediately above the venturi section. The transparent tube has a lower end which extends into a container, which container is to be filled with a liquid. The tube's lower end is positioned at the full level of the container. Air rising through the tube and accelerated in the venturi section will cause the bead to move and indicate when fluid is at the level of the end of the tube in the container. In a preferred embodiment of the invention, the tube is coupled to a specially designed funnel.

Abstract: A fluid-level indicating device comprises a tube having an upper section provided with a visible, movable structure which indicates when a container is filled with liquid. In a first embodiment, the indicator is a solid bead positioned above a venturi section formed in the tube. In a second embodiment, the indicator takes the form of an indicator fluid forming a plug or seal disposed in a continuous loop section formed in the tube.