66 may have a tapered surface 70 to facilitate insertion into the waste water strainer 20 fig6 shows an insert 34 of the present invention that uses a plurality of resiliently deflectable buttons 74 which are integrated or inserted into holes of the insert 34 to help maintain the insert 39 s 34 position within the strainer 20 for example an insert 34 having a plurality of holes 78 radially drilled through the wall 40 may be provided the buttons 74 which are preferably made of an elastomeric material are inserted within the holes 78 and extend out from the wall 40 such that the effective outer diameter of the wall 40 is increased to correspond with the inner diameter of the strainer 20 thus the frictional engagement between the buttons 74 and the strainer 20 help secure the insert 34 within the strainer 20 although three buttons 74 are shown one skilled in the art will appreciate that any number of buttons may be integrated into the insert 34 referring now to fig7 and 8 another embodiment of the present invention is shown that employs a plurality of elongated shims 82 here the strainer 20 includes a wall 40 having a plurality of indentations 86 that receive elongated elastomeric shims 82 the shims 82 are similar to that of the buttons described above and are sandwiched between the strainer wall 28 and the wall 40 of the.