they actually make propress fittings for gas. it's a different o-ring / yellow.
in the older areas with meters at the curb, we still find copper gas mains.
typically because we have to install earthquake valves when the house is sold or remodeled.
In Toronto, Canada most new houses have 1" black iron from the outside gas meter through the foundation wall. Then at that point they make sort of like a manifold with 1"- 1"- 1/2" black iron Tees with valves at this point which all the copper tubing will feed off of. Going to each of :water tank, furnace, fireplace, gas stove, etc etc.
All old houses (say 10 year +) nautral gas will be piped in BLACK IRON all the way to the appliance- no copper.
Like I said: I never liked that copper tubing idea for natural gas.
So Rick, the bigger question I have is, did you convince them to buy a K60?
AFM has it right. Here they also ask us to explain for the DIY.
Earlier post - what is the problem with DIY.
Now that you ask I will tell you. Here we have a rigorous process of Licensing which benefits mostly the SLUGS and Grubs(Legal Fraternity persay) whoi chase Plumbers just like they chase Ambulances. Then there is the DIY that has just blown up their house, the neighbors among other things and then they expect the Insurance company to pay out. I am happy to open up the industry if all of our licenses and insurance premiums as well as every other thing we are held responsible for is gotten rid of.
Not everyone can be a plumber, at least not by shopping at the suppliers or similar
Speaking of framers and their nailguns, I was doing a Dorm building at UC Irvine years ago and sitting down for break with other plumbers when a framer started nailing off some shear panel on a wall accross the room, when appearently he was missing the studs and nails were flying at us like a machine gun. We immediately hit the deck as nails richocet all around us. We yelled for him to stop, but amazingly he did not speak or understand english! Then it came to me.......Alto! Alto! He stopped and walked around the wall and wondered why he had to stop. I believe that the old code that allowed copper gas piping states that it was a tin lined type that supposedly countered the corosion issues.
Did Rick convince them to buy a K60.. That one really cracked me up!!!
Just like you said, things are slow, sell to anyone. Rick is right on the money when it comes to that product!! Rick, if something bad did happen and this guy hooked up with one of the "sharks"(lawyers) that are all over this country, he may have been able to bring a case against the supply house for selling him that product without a license in the first place. Sure, he doen't care now, but when things go wrong(God forbid a fire or explosion) he's going to point fingers at anyone he can but himself. If he buys a new WC at retail price from said supplier, who cares? As long as he's not buying at your price, who's he going to hurt setting his own toilet? Odds are he'll get it right and that'll be the end of it, or, he'll try it 2-3 times and give up; call a pro. Good for you sticking to your guns and not offering advice to this guy. Hope they explained this clearly to the girl at the counter.
Some suppliers around here sell only to plumbers/contractors, others sell to anyone. If you are a homeowner working on your own house you can do anything you feel confident doing, plumbing, electrical, HVAC. If working for someone else, you must be liscensed and have permits just to buy the materials.