The ornamental design for a water and gassupply mount, as shown and described.
FIG. 1 is a front perspective view of a water and gas supply mount showing my new design in a position of use with environment.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a rear perspective view thereof.
The broken lines showing water and gas supply valves in FIG. 1 depict environmental matter and form no part of the claimed design. The broken lines in FIG. 8 represent portions of the mount that form no part of the claimed design.