Thanks for all the good responses to my question. Looks like it will be 7/8 6 point. The TT is currently upstate at a seasonal site and I want to blow out the lines to prevent what may be a mid October below freezing temperatures in northern Pennsylvania. I just want to make sure I have all the right tools and parts along. I Plan to winterize the unit in the conventional manner in mid November. We plan to use it 2 more times before Thanksgiving. I plan to get some extra plugs and look into the more permanent drain for these late season drains. Thanks again.