The ornamental design for a wrenchextension apparatus, as shown and described.
FIG. 1 is a top-front-left perspective view of a wrench extension apparatus showing my new design;
FIG. 2 is a bottom-rear-right perspective view thereof;
FIG. 3 is an enlarged front elevational view thereof;
FIG. 4 is an enlarged rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right elevational view thereof; and,
FIG. 8 is a left elevational view thereof.
The broken lines showing fastener orifices in FIGS. 1-2 and 5-6, and the broken lines showing tube openings in FIGS. 1-4 are included for the purpose of illustrating aspects of the article that form no part of the claimed design.