The ornamental design for spa jetbody with venturi, as shown and described.
FIG. 1 is a first side perspective view of the spa jet body with venturi.
FIG. 2 is a second side perspective view of the spa jet body with venturi.
FIG. 3 is a first side view of the spa jet body with venturi.
FIG. 4 is a second side view of the spa jet body with venturi.
FIG. 5 is a bottom view of the spa jet body with venturi.
FIG. 6 is a top view of the spa jet body with venturi.
FIG. 7 is a front view of the spa jet body with venturi; and,
FIG. 8 is a back view of the spa jet body with venturi.
The broken line disclosure is understood to illustrate portions of a spa jet body with venturi in which the claimed design is embodied, but which form no part of the claimed design.