interior drains Home › Forums › Archives › Old Bulletin Board Archives › interior drains This topic has 0 replies, 1 voice, and was last updated 25 years, 7 months ago by Christopher Jones. Viewing 0 reply threads Author Posts 11 Aug 1998 at 3:58 am #281046 Christopher Jones under what conditions or justification can i run a drain pipe, carrying some solids, at a pitch of one inch to 100 inches?? Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.