Product review (5 stars): Such a simple concept, they really do the trick
Well, these don't seem like much, but they really do the trick.  We had drain issues so started to do a few things to prevent as much lint as possible from going down the drain.  These connect easy and you can replace them easy.  They really stay on.  While you do have to replace them often, they are inexpensive.  If you're looking for a reliable, pain free, inexpensive way to keep washer lint from going down your drain, I recommend you giving these a try.