Does anyone know what the manufacturer trade name is for the 'rigid' silicone fuel tubing we prefer that doesnt kink & squeeze off as much as the regular sport grade stuff? I want to order a spool. Seems to me it used to be Prather, but they are long gone. The closest equivalent I can find at the hobby shop is Dubro medium 'super blue?' or something to that effect. And even it seems a tad less rigid / wall thickness vs the pink stuff like on Jett tanks.