Copper plate is either 2 or 3mm.
My piping is 1/2" pipe. I actually milled a flat on it to make it easy to solder.
Not sure what street-90's are?
Once you have the technique right, soldering pipe is dead easy. My technique is:
Make sure joints are quite clean.
Place flux on the pipe and put in the elbow/whatever.
Heat the joint, occaisonally touching the solder to it until it begins to melt.
Then just touch the solder to the joint and it should be sucked in and run around the joint.
I silver soldered mine, as I just got a MAPP torch,
If you do it right you get no leaks.
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