Originally Posted by gasman
If they are both the same size, you can just flair the poly just like the aluminum and use the same union you would use to connect two aluminum flairs.
It may depend on your description of "poly"
If it's the stiff tubing used for air brake lines it might work. If it's the more flexible polyurethane tubing (that I prefer) then it won't work.
Use the good made in the USA tubing though.
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