Transparent Extractor Nozzles/Head/Tool

All of the consumer grade carpet extractors (like the Bissel LGCM) have a transparent plastic tool/nozzle/head (I dunno what the exact term should be, they call them a "tool" in the store here), so you can see the "color" of what you are extracting from the carpet/upholstery.

From what I can see in the store pictures, the pro machines sold here (Mytee and Aztec) have a solid stainless steel tool, so you can't see the extracted fluid. To me that's a negative, because you can't tell if what you are extracting is clean (people who have used these machines feel free to correct me). Of course, the plastic ones on the consumer machines always break.

Then in another thread, Mike Phillips posted a picture from one of his Boot Camps, and well, this tool clearly (ha ha) has a transparent viewport thru which to see the extracted effluent.

Mike or someone else, what tool or machine is depicted here?

So it looks like from the pictures it's the Aztec Hot Rod that has that transparent nozzle. I can't tell from the store pictures; is the Hot Rod tool still like that? And the Mytee tool isn't?

LOL, fair enough, Mike!

EDIT: I think I found the answer, it looks like that wand is from a Durrmaid extractor that isn't sold here presently: Durrmaid Super 1600 Hot Water Extractor, carpet cleaning machine, carpet spotter, carpet extractor, carpet cleaning equipment, durmaid