The ornamental design for a canister for magneticfilter, as shown and described.
FIG. 1 is a top perspective view of a canister for a magnetic filter;
FIG. 2 is a bottom perspective view of the canister shown in FIG. 1;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawings depict portions of the canister for magnetic filter that form no part of the claimed design. The dot dash dot broken lines in FIGS. 2 and 8 depict the boundaries of the claim and form no part thereof.