sides of the insert wall 40 outwardly to place the lip 94 in engagement with the strainer wall 40 again one skilled in the art will appreciate that opposed to a continuous wall many tabs or subwalls may be provided by this embodiment of the present invention fig1 an alternate embodiment of the present invention is shown wherein an adhesive 110 is used between the insert flange 36 and the strainer body flange 24 an engaging lip 38 may also be included to help center the insert 34 with respect to the strainer body 20 fig1 shows yet another embodiment of the present invention where a plurality of set screws 114 are used to secure the insert 34 into the strainer 20 an engaging lip 38 may also be included in this embodiment to help center the insert 34 into the strainer 20 in view of the foregoing one of skill in the art will appreciate that the methods of inserting and securing the insert into the strainer may be combined more specifically embodiments employing the set screw 114 or an engaging lip 38 may also include seals buttons or other centering and sealing mechanisms described herein fig1 22 show an insert 34 of another embodiment of the present invention that is positioned within the waste water strainer 20 by way of one or more edge engagement members 148 the edge engagement members have an outer portion 122 that selectively engages the waste water strainer 20 the edge engagement member 118 also includes a finger 126 that interfaces with the inner surface 130 of the insert 34 the.