Hey Wally,
Just seen your post and as usual too late!
I use these in my brewery and there great! I have just upgraded my old camlocks with these as I saw them on a friends system, so much easier!
They seal really well, you don't burn your fingers which switching hoses (well at least i dont!!) and they are food grade and heat resitant!
You should post a photo of them on here so people can get an idea of how good these things are if they don't all ready.
Good luck with the sale!
Jimbo Jones