So I've bought two of these valves, which will make three (of sorts) in my possession. The first one bought is from SOR, used. Didn't work, frozen stuck (closed). Somebody didn't inspect it, just packed it. Upon soaking in a myriad of chemicals it remained stuck, and is now pretty much destroyed by me in trying to get it apart - the part that screws into the steel body is brass, very soft and doesn't take a wrench very well. The shaft is also brass, soft and easily bendable. Not a good day for Toyota's design department. So that was $50 in the trash - lesson learned not to buy used parts from SOR anymore, though I had good success in the past IIRC. Good news is I salvaged the twist thingy on the end for aiding in opening/closing. Second purchased one is actually still in route - looks complete but rusty. We'll see if I can make it functional. The third one on hand is the one that was on the engine, and it was frozen as well. It was missing the twist thingy, which of course I now have one from SOR that only cost $50. I've managed to get it disassembled, and maybe functional. There is a seal of some sort inside that appeared to be something like wrapped fibers. It was toast. I replaced it with a thick rubber washer from a multi-rubber washer kit. I redid the threads on the shaft as well as the brass plug it screws into with a tap/die (6x1.0), and the shaft goes in and out reasonably well. When closed, no air passes, and when open and with the outlet plugged, no air escapes along the shaft. So I'm hoping this (or the one in route) will function and not leak after it's been subjected to hot coolant and time. Thesis over. Good luck with yours.
Thanks again and I'll post up pics of the results. 
