Do you punch a hole before the fire wall? sorry about all the questions... Just starting.. so if I realy understand instead of passing the tube in the fire wall you just put a hole on the side and stick the pipe in it... and you use a cupling to joint the two pipes... Pretty neet and must work pretty good... I was wondering why most of your pictures you had some medical clips holding your pipes on the sides... Now I know... will go to bed less stupid tonight...
Thanks for your great help... I hope the weather stick around... want to go fly my other plane tonight...

Take care...
eric