strainer 20 to hold the insert 34 in place in one embodiment the resilient ring member 46 is an o ring alternatively the waste water insert 34 as shown in fig4 has a second groove 48 in spaced relation to the first groove 44 with a raised surface 50 therebetween the second groove 48 receives a second resilient ring member 52 that also engages the cylindrical wall 28 of strainer 20 additional grooves and rings may be added as desired the insert is installed by inserting the cylindrical wall 40 of the insert 34 into the opening 16 fig2 of the strainer 20 until the insert is in place at this point the resilient ring or rings of the insert will engage the cylindrical wall 28 of the strainer 20 to hold the insert 34 in place no tools are required and the inserts are quickly easily and securely installed to achieve their required purpose fig5 shows another embodiment of the present invention where the insert 34 is used in conjunction with an enlarged seal 66 here the seal 66 extends from a lower surface of the flange 36 to a lowermost portion of the insert 34 one skilled in the art however will appreciate an enlarged seal 66 of any shape may be employed the seal 66.