Purification Cassette

FIG. 1 is a front perspective view of a purification cassette showing our new design; FIG. 2 is a front elevation view thereof; FIG. 3 is a rear elevation view thereof; FIG. 4 is a right side elevation view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; and, FIG. 8 is a rear perspective view thereof. The dashed broken lines in the figures illustrate portions of the purification cassette that form no part of the claimed design.