Price of copper tubing!

volaredon said

Yeah I have brazed plenty of sheet metal (steel) over the years, none recently though. Never tried to braze any other type of metal.
I know that with copper there is a type k,L and M kind of like pvc or steel with the different schedules, (40, 80, 120) for different pressure ratings, but are there different fittings L,T, cross, etc for higher pressure copper?

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The OD on K, L and M are all the same. It's the ID that gets slightly smaller with the thicker wall. Don't use the M, it's about as thick as tinfoil.
I haven't seen any thick-wall fittings but then I didn't worry about it. The "normal" plumbing and big-box store fittings are fine!
I have run my (soldered) 1" type L system at 140 psi for years with no problems.