Installing toilet in a basement already roughed-in Home › Forums › Public Forums › General Plumbing › Installing toilet in a basement already roughed-in This topic has 2 replies, 3 voices, and was last updated 22 years ago by Retired plbg1. Viewing 2 reply threads Author Posts 12 Jan 2003 at 6:53 pm #276199 MasterPlumbersKeymaster there is a knock out in the toilet drain how do i remove it??? just “hammer away”??? 13 Jan 2003 at 4:55 am #293613 robertgfParticipant yep 13 Jan 2003 at 11:09 pm #293614 Retired plbg1Participant Make sure it dont go down the drain, break a little hole in the top and grab it with channel locks and then break away. Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In