I went to a propane dealer to get a 5-pound propane tank and new pigtails to go from the tanks to the changeover regulator on the TM. The woman there, who seemed knowledgeable but didn't know about the auto-shut-off feature of the QCC1 nuts, was telling me that the black and green plastic nuts that attach the pigtails to the tank are interchangeable. The colors just designate different size fittings on the hose end.
These nuts:
I came home and did a bit of research, and both the Marshall Brass and Bergquist catalogs have black QCC1 nuts that handle a max of 70,000 BTUs, and green nuts that max out at 200,000 BTUs.
My nuts are faded.
For those that have later model units, what color are yours? I hope they are green.
Thanks,
Dave