I'm curious about how wall cleanout cover plates are attached. I've seen special cleanout plugs that have a threaded insert and come with their own cover plate. Presumably, the long cover attachment screw that's included is cut in the field so that it doesn't bottom out in the threaded insert embedded in the plug?
But I've also seen a number of cover plates sold separately from cleanout plugs. Many are packaged with a wood screw and, from photos I've seen on the internet, it appears that people are screwing the cover plate mounting screw directly into the PVC or ABS cleanout plug. It seems to me this would compromise the air/water tight seal of the plug. Are people doing this wrong? If so, how are these cover plates supposed to be attached?
But I've also seen a number of cover plates sold separately from cleanout plugs. Many are packaged with a wood screw and, from photos I've seen on the internet, it appears that people are screwing the cover plate mounting screw directly into the PVC or ABS cleanout plug. It seems to me this would compromise the air/water tight seal of the plug. Are people doing this wrong? If so, how are these cover plates supposed to be attached?