The fittings are made of brass with nickle plated.They are used for connecting pex pipe and the color is yellow and silver. The brass fittings can divide into coupling,nipple,elbow,tee,cross,plug,and bushing etc.as per your requirement.They are used for connecting pex pipe of the size 1216,1418,1620,2026,2632. Brass Fitting for Pex Pipe