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I know im going to get slaughtered here but I had to tie in two new gas riser I ran into the existing main run across the cellar which was at the same elevation and close to the heating main run long story short i really really wanted to use union because i know its all getting ripped out in a couple years as im renovating from the top floor down. before yoy tear me up know while not a plumber i am a HVAC guy though tin side. and have built and plumbed hald a dozen homes in my life i have my own threading equipment even so im not a novive i know code and i pressure tested in fact the two new runs to the top floor had gauges on them for over a year while i agonized over HTF i was going to get pipe from four directions to line up perfectly enough for right left coupling all so close together[ piece of cake] the only catch was i would have to come out of the tees i put into existing with street elbows even the i had to drift the main down 1/4' from the meter 30' away. yeah I know street elbows and gas. It seemed a lot of these rules go back to manufacturing problems that no longer exist these seemed to have a bit of taper but not as much as usual. since i had to put the two tees and two elbows together in the vice i got it all very tight and i kept all four sections of pipe independently pressure tested as i worked mainly to know if i got a leak where it was before i got to far with this difficult tie in. so i felt so much better having done the right job with the 1 1/4 right/ lefts but now am obsessing on the street elbows. ironically 30 feet away the utility has used unions street elbows and bushings all leading into the meter which is only supported by the pipe attached to it and a piece of rope someone tied to a vent line above. so much for licenses. while looking into the union issue i realized despite many on here and elsewhere telling people who inquired about unions they were going to die when there house exploded and kill their kids and neighbors too, it was also obvious many parts of the US use unions routinely and some areas forbid right lefts but my judgement had to admit left right done properly were going to be a better job much better. the street elbows didnt worry me until of course i was done i still cant find a way around them short of redoing the entire cellar piping which like i said in a few years is in the plans.