The ornamental design for a snap-in electrical receptacle, as shown and described.
FIG. 1 is a front perspective view of a snap-in electrical receptacle showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a side view thereof.
In the drawings, the broken lines are for the purpose of illustrating portions of the snap-in electrical receptacle that form no part of the claimed design.