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.

RUBBER INSULATION (AEROFLEX)
Aeroflex Tube Insulation is a flexible, closed-cell and lightweight elastomeric material designed for insulating cooling and heating lines. The closed cell structure of Aeroflex provides