Patent ID: 8434634

Claim:
A cap for a container, the container including a threaded aperture, the cap comprising: a threaded inner body configured to engage the threaded aperture; an outer body configured to be rotated in a cap-threading direction, to install the cap on a container, and in a cap-unthreading direction, to remove the cap from the container, the outer body being rotatable relative to the inner body; a ratchet mechanism operatively positioned between the inner body and the outer body, the ratchet mechanism directly transmitting rotation from the outer body to the inner body in the cap-unthreading direction and transmitting no more than a predetermined amount of torque from the outer body to the inner body in the cap-threading direction; a gauge assembly positioned on the inner body, the gauge assembly including a float supportable at a level of fluid within the container, an indicator dial, and a pointer movable in response to movement of the float with the level of fluid in the container, the pointer cooperating with the indicator dial to indicate the level of fluid in the container; and a translucent crystal positioned over the indicator dial and the pointer, the crystal being fixed relative to the inner body.