Cap for sealing nipple

1. A cap for covering a nipple having a rounded tip defining an aperture, the cap defining a cavity comprising an open end, a neck, and a closed end, wherein the cavity narrows from the open end to the neck and remains constant or widens from the neck to the closed end, the closed end comprises a flat inner surface against which the top of the rounded tip presses, and the neck forms an interference fit with the side of the rounded tip.

2. The cap of claim 1 , wherein a first angle from the open end to the neck is smaller than 45 degrees.

3. The cap of claim 2 , wherein the cap has a circular cross-section along its length.

4. A system, comprising:

a nipple comprising a rounded tip, the rounded tip defining an aperture; and

a cover comprising a cap for covering the rounded tip, the cap defining a cavity comprising an open end, a neck, and a closed end, the cavity narrowing from the open end to the neck and remaining constant or widening from the neck to the closed end;

wherein the closed end comprises a flat inner surface against which the top of the rounded tip presses, and the neck forms an interference fit with the rounded tip, and the interference fit forms a sealed compartment in the cap that encloses the aperture.

5. The system of claim 4 , wherein a fluid leaking from the aperture reduces the volume of the sealed compartment and increases the air pressure in the sealed compartment, and the increased air pressure prevents the liquid from leaking further from the aperture.

6. The system of claim 5 , wherein a chamfer angle of the cap from the open end to the neck is smaller than 45 degrees.

7. The system of claim 6 , wherein the cap is annular.

8. The system of claim 7 , wherein the cover further defines an annular apron concentric with the cap, the cover covering another portion of the nipple.