The replacement (upgrade) that my dealer sells I would call a poly propolene material and 1/4 i.d. , it is hard plastic tubing and it doesn't appear to come off a roll as the pieces are precut and staight as an arrow , plastic tubing off a roll like used on air lines on trucks probally would not work as it would probally never straighten out ,but could possibly be straightened out as in the past with the old style clear tubing I would put a clothes hanger thru the tubing over night and it would straighten it out some what , have never tried it on hard tubing ----today I have to change a pick up in a 963 which I found out yesterday that it still uses the clear tubing as it is so long they don't have a replacement for it in the black hard tube --------you really should change the rubber bushing that holds the pickup tubes 90 dgree fitting into the top the tank as it gets swollen from the diesel , being that has to come from the dealer you might as well take the ride