The ornamental design for a tank-type air compressor, as shown and described.
FIG. 1 is a front perspective view of a tank-type air compressor showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in FIGS. 5, 6 and 8 are included for the purpose of illustrating portions of the tank-type air compressor that form no part of the claimed design.