Spa Chair Base

FIG. 1 is a front perspective view of a spa chair base showing the new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a rear perspective view thereof;

FIG. 6 is a right side perspective view thereof; and,

FIG. 7 is a left side perspective view thereof.

The broken lines depict portions of the article that form no part of the claimed design.