Copper Elbow Long Radius (LR) is installed between pipes to change the direction of the pipe by 90°. Its centreline radius is 1.5 times than the diameter of the pipe. This is often used in piping as pressure loss is less as compared to short radius elbow.

COPPER COUPLING
Copper Coupling (or coupler) is a very short length of pipe or tube used in piping or plumbing, with a socket at one or both