help with hard line and fittings

i read in another topic i could use fuel/brake line for air with ptc fittings. i got some aluminum 3/8 brake line and it acts like it works in the fittings but i can pull it out with some force. did i get the wrong line or fittings?

when i used copper line i used compression fittings because the line wouldnt stay in the ptc fittings, i think you can also use flare fittings

Like wayne says you can use compression fittings but I recommend using flare fittings. I have used them several times and other things and never had a problem with them leaking or popping out. You will have to buy a tool to flare the copper though.

You can use the push connect fittings with copper(not sure of other hard line but dont see why not) as long as you get the correct ones. I believe the ones I had were legris. I think parker makes some that will work also.

where can i get stainless compression fittings at? ive looked at a few sites and cant find them.

www.hydroholics.net

I've used aluminum fuel line flared with stainless nuts with success in the past.

ive seen a guy in houston use norgen nickel plated ptc to use with aluminum fuel line and never have a problem at all

I use 3/8 stainless tube & Russel AN fittings,you'll need a good tube bender & 37 degree flaring tool( I use Rigdid).Should be able to find @ hot rod shop

exstensive metalworx uses copper line and push connect fittings..alot of daily drivers from there no problems..i remember a article in a magazine bout it before also..