I still haven't finished fixing the gas piping on my standby generator because of stories like this about Chinese black pipe fittings. I bought some American made pipe fittings for the job, but I have not yet found all the American made fittings I need for the job. An HVAC guy replacing a steam boiler in a Youtube video cracked a new black pipe fitting. He noticed right away it was made in Vietnam and searched through his stock of fittings for a USA fitting which worked just fine.