Could this be transite?

[tcrews42]

This was in a house built in 1976 in Edmond, Oklahoma . Sub slab duct pipe had a cementitious texture. ive seen pics of transite, but never dealt with it first hand and of all the pics ive seen it was never pulling out of the slab like this. This was loose in the hole, but too long and wide to have been inserted through the floor register. I could not get my camera inside the pipe for a pic without damaging the pipe(more) or my camera one. My guess is transite or the like, just wanted a second opinion.(or more)

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[John Kogel]

Yes, it could be Transite and it probably is, given the date of the build.

If you have googled it, you have already seen pics of pipe that are very similar.

[John Dirks Jr]

There's some good information on Transite duct work at this link.

http://inspectapedia.com/hazmat/Asbesto ... _Ducts.htm