Wall adaptor for filter underdrain

FIG. 1 is a front view of a wall adapter for filter underdrain of a first embodiment showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front perspective left side view thereof;

FIG. 6 is a rear perspective view thereof;

FIG. 7 is a front perspective view thereof;

FIG. 8 is a front view of a wall adapter for filter underdrain of a second embodiment showing our new design;

FIG. 9 is a rear view thereof;

FIG. 10 is a top view thereof;

FIG. 11 is a bottom view thereof;

FIG. 12 is a front perspective view thereof;

FIG. 13 is a rear perspective view thereof; and,

FIG. 14 is a front perspective view.

The broken line showings of FIGS. 7 and 14 depict environment only that form no part of the claim.