Non-metallic Tubing

[fifty60]

Anyone know what the trade name is for non-metallic tubing that has smoother ribbing than this:


It looks exactly like the ribbed tubing above, but ribs are much more smooth...

 

[cpinetree]

Carflex? http://www.carlonsales.com/carflexexflexnmconduit.php
liquid tight flexible nonmetallic conduit: google results:https://www.google.com/webhp?gws_rd=ssl#q=liquid+tight+flexible+nonmetallic+conduit