3/4 in. Copper Pressure Cup x Cup Union Fitting

Replace it.

Can be don't don't advise you doing so as the soil will work against you when you try to open it in the future.

This is a Chinese unit. No telling the manufacturer even though there is a name on it.

Shark bite

yes, that is what I did.

No

Yes! Both ends. You do need to know how to solder.

Yes if installed properly but would go with a higher strength then soldier like a brazing material to be on the safe side especially if you go higher then 150.

Yes. Soft copper Soft (or ductile) copper tubing can be bent easily to travel around obstacles in the path of the tubing. While the work hardening of the drawing process used to size the tubing makes the copper hard or rigid, it is carefully annealed to make it soft again; it is therefore more expensive to produce than non-annealed, rigid copper tubing. It can be joined by any of the three methods used for rigid copper, and it is the only type of copper tubing suitable for flare connections. Soft copper is the most popular choice for refrigerant lines in split-system air conditioners and heat pumps. Rigid copper Rigid copper is a popular choice for water lines. It is joined using a sweat, roll grooved, compression or crimped/pressed connection. Rigid copper, rigid due to the work hardening of the drawing process, cannot be bent and must use elbow fittings to go around corners or around obstacles. If heated and allowed to cool in a process called annealing, rigid copper will become soft and can be bent/formed without cracking.

Simple question and a complicated answer. 5/8" OD. What is the difference between L and M copper pipe? Type L and Type M copper pipe. ... But for normal “in the wall” household plumbing, Type M copper pipe is just fine. You may be surprised to find two types of copper pipe on the home center shelf, Type L and Type M. The difference is the wall thickness of the pipe and therefore the pressure it can handle. Standard Copper Tubing Dimensional Reference Select Mechanical or Inflatable Pipe Plugs based on the below tubing ID and along with the pressure to be blocked Nominal Pipe Size inches O.D. I.D. Wall Thickness Type OD K* L** M*** DWV**** K L M DWV 1/4 0.375 0.305 0.315 - - 0.035 0.030 - - 3/8 0.500 0.402 0.430 0.450 - 0.049 0.035 0.025 - 1/2 0.625 0.527 0.545 0.569 - 0.049 0.040 0.028 -