The ornamental design for a modular gas controlattachmentassembly, as shown and described.
FIG. 1 is a perspective view of an embodiment of a modular gas control attachment assembly showing a new design;
FIG. 2 is a top view of the modular gas control attachment assembly illustrated in FIG. 1;
FIG. 3 is a bottom view of the modular gas control attachment assembly illustrated in FIG. 1;
FIG. 4 is a left side view of the modular gas control attachment assembly illustrated in FIG. 1;
FIG. 5 is a right side view of the modular gas control attachment assembly illustrated in FIG. 1;
FIG. 6 is a front view of the modular gas control attachment assembly illustrated in FIG. 1; and,
FIG. 7 is a rear view of the modular gas control attachment assembly illustrated in FIG. 1.
The broken lines, if shown, in the drawings illustrate the portions of the modular gas control attachment assembly that form no part of the claimed design. In the drawings, the claimed design is defined by the shaded surfaces.