I realize most people already have them, but if you are looking for a yellow tube you do not have to dye I found a website that sells them very cheaply, 50 cent a foot, thing is the outer diameter is 3/8" and looks a little small to me, but it could be the very size for all I know
the tubing is transparent yellow and you can order it in as many feet as you like, however I am aware there is an anti-sell policy here so I will not post a link unless I get an OK about it
the website is not mine nor is it a Ghostbusters prop site, it is an Aircraft supply website I found the other day
-Drakk )))
There is no anti-sell policy any longer.
I have 50 feet of the tubing, and will be selling it on the new Prop Archive Store.
Ok, but should I post the link then if you are going to be selling it as well? like I said I am not sure of the exact size of the original tube so what I found might not even be the correct size
-Drakk )))
Its up to you. I don’t know what size is correct either, its not really something that has been discussed thouroughly. But its probably the same stuff I’ve got.. 3/8" ID, 1/2" OD.
Thats a pretty bad picture they have up.
But I’m sure its the same or really close to what I have. Here is a picture of that:

