There are various reasons for this which I'm not going to even bother getting into because they are irrelevant. Bottom line is copper is NEVER ALLOWED BY CODE IN THE US FOR NATURAL GAS DISTRIBUTION! It is very common to see copper tubing used in rural areas for propane gas distribution. ...
To install a copper pipe union, begin by sweat-soldering the male shoulder onto one pipe as described above. Then slip the nut onto the adjoining pipe and solder the female shoulder onto the pipe’s end. Let the pipes cool. Then push the male and female parts together, slide the nut ov...