Vapor Fire 100 manometer install

[jonher]

Hi folks - I have a vapor fire 100 furnace on order so I've been reading about how to install and tune it. One of the recommendations was to make sure you had a good handle on the draft and many folks recommended getting a manometer. I ordered a Dwyer Mark II model 25 since that seems to be what most folks use but I had some questions about the install. Sounds like it should go close to the furnace on the flu before the dampner and it looks like most folks use like a copper brake line to attach to the flu since the rubber hose would melt. How do folks do these connections? I assume I want a couple feet of copper line but then how do you handle to connections to the flu and to the meters rubber hose? I assume they should be air tight? Any info folks have would be appreciated! Thanks