daz if you want to make the 6 mil fit better, what you can do is cut a small length of pole hose about 2 inches long and put that over the 6 mil barb that will make it about 8 mil (red hot hose is good) then put your thermobore over this and tighten nice and tight with the clip, this is what i do to use the plastic connecters from aquadapter which are only 6 mil and it works well, i also use hot sometimes