traditional plug having threads is used however this embodiment of the present invention also includes a diaphragm 54 positioned on one end that may be cut away after testing is complete referring now to fig2 23 yet another version of the test cap 176 is provided with an inner surface 196 of malleable material that helps seal the interconnection of the test cap 176 and the overflow elbow 18 that is by interconnecting the test cap 176 onto the external threads of the overflow elbow 18 the end of the overflow assembly 2 will deform the inner surface of the test cap 176 somewhat to create a seal it is also envisioned that a test cap 176 of this embodiment of the present invention employs a diaphragm 54 that can be cut away if needed referring now to fig2 26 a protective drain cover 200 is provided here the protective cover 200 having an opening 204 therethrough and a flange 208 is shown emanating from the flange 208 is the tubular wall 212 having a groove 216 positioned therearound the groove 216 is adapted to receive at least one seal 220 the protective cover 200 is adapted to be associated with a strainer 224 of the drain assembly 110 thereby positioning the flange.