Boiler Brush

FIG. 1 is a left side elevational view of the boiler brush, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a front, left perspective view thereof, shown in an environment of use.

The broken lines shown in FIG. 6 are for the purpose of depicting environmental subject matter, and form no part of the claimed design.