I have a stainless braided line that came with the typhoon intake and rails. The flex line when held up to the light you can see through it. Shouldn't there be some sort of rubber in the line?

 

if there is no teflon in the lines then you got issues.

 

seeing light would be a bad thing for sure id say

 

You have the line hooked to your bong??
If there were no liner, the braid would be soft/floppy...

 

It bends but not super easy. I put a light on one end and looked through the other to try and see the inside it appears to just be braided metal. I may take it back and just upgrade to the fast. Thanks to summits 90 day return policy.