old part was unsightly and sometimes even leaking after 15 years. So replacement was needed. Ordered, delivery came after 3 days. Remove the previous sequence took about 2 hours as the threads move barely let up after the years. The installation of new waste was done in a few minutes. The seal at the outlet was not there, because of the small thickness of the drain fitting I have installed no rubber seal but a hard paper gasket. The stays where it belongs. An installation manual is missing, actually unnecessary for such a simple product.