Is there a specific name for the part of a bathroom nozzle the holds the washer? I have a two handles brass BR faucet with a flat wide spout that I believe need a washer which I ordered. The problem is it seems like I'm going to need a part yo hold it. When I feel the inside of the water outlet, it feels like it's missing something. I can use all of the help I can get in more ways than one! Thanks in advance!!