On Tuesday, November 29, 2016 at 10:44:04 AM UTC-5, fyou2 wrote:
replying to Eric in North TX, fyou2 wrote:
The pros dont use unions because it is against code to use unions on gas pipe.

Better tell that to my gas company. There are unions at the meter.

Yes, so the meter can be replaced or at the dryer after the valve. You
won't find them on the main runs though, just couplings or larger pipe
may be welded.