Four vial level

The ornamental design for a “four vial level”, as shown and described.

FIG. 1 is a side elevational view of a “four vial level” showing my new design;

FIG. 2 is a left end view thereof;

FIG. 3 is a right end view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

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