Yes, I Know. I apologize. His thread was 2 years old.
Like I said. Just trying to help the other guy. I know how hard it is to get certain things these days.

Do you have any talent besides being rude?

The Thread was old. The guy sounded like he needed them. We are here to help each other. Right?

They are not just used for lab pipe. Also used for...

If you look at the left side of the bottom photo, there is a mount there where the arrow is.

If you get desperate, I can machine one for you.

I have some of those brand new in the box. Not exactly the same. The mount is machined aluminuim instead of cast. I think they have 6" 8" and 12" holes. If you are interested, Make me an offer that...

Im looking for a 24" ribbon burner.
Please let me know if you have one.

If you make me a simple drawing I can cast or machine the parts for you.

If you want batch, I can make batch either soft or boro. I have trona too.
I dont know if you can melt the boro batch. It takes a lot of heat. But if there is a market for it I can make clear boro...

Does anyone make their own glass? I have a good quality quartzite on my ranch that I use myself. It is about 98.9% SiO3 and has less than .075% Fe2O3.
Id package it in 5 gallon pails (60lb or so)...

That part is called a tube insert. They used are used for situations where you will have a negative pressure inside a tube such as specially cleaned dry pipe. I havent seen rubber ones in a while....