Compression fittings unscrew. Inside you will find an 'olive' (a thin copper ring) which is compressed onto the pipe to create a seal when the outer nut is tightened up. If you wish to replace the compression fitting then you may need to use a junior hacksaw to saw through & remove the olive - be careful not to cut into the pipe unless you wish to replace it too. As for the dishwasher I would guess that you could use the same fitting unless it is leaking. If it is leaking then replace the olive as above.
Depends on how it is connected flare, compression or brazed or soldered or screwed IPS or FIPS
Never
1st you need to know where the leak is. The only time a copper fitting or brass fitting will fix a leak is in the watersupply connection.
Sweat a female fitting on the copper or use a compression coupling between the two.
compression fitting.
Copper x copper, which means the fitting is sized for copper pipe and usually needs to be soldered unless it is a compression type fitting.
You use a compression fitting or something like a Sharkbite.
No!!!! Use either a compression fitting, or what they call a Sharkbite, these things are incredible and will attach PVC, PEX, or copper using the same fitting.
If that's where the freezing occurred and the compression fitting wasn't tight enough.
Did you put the ferrule on, the little brass ring?
38 polyethylene piping does not exist.
C = cupped end - the type you would slide over another pipe to make a sweat connection FTG = fitting end - the type that slides inside a cupped end, also called a "street" fitting M = male pipe threads FE (sometimes listed as just F, not correct)= female pipe threads The "X" is "by", so C X C is "cupped by cupped", a fitting with two ends such as a coupling or elbow, both cupped for sweating onto a pipe or fitting end. C X C X C would be a fitting with three ends such as a tee, all cupped. C X FTG could be a street elbow or a reducing bushing, one part slides over a pipe, the other inside another cupped fitting. C is indeed a cupped fitting. CMP is compression, but there is no such thing as a copper fitting with a compression connection. There are brass and plastic compression fittings that will fit copper pipe, but not copper compression fittings.