A is a sort of accommodating that is utilized to interface two diverse line sizes. It forestalls the external width of one line from entering the inward measurement of the other line, and it makes an impenetrable seal. It likewise keeps up with the arrangement of the lines. Rib fittings include a line and a strung coupling. Strung couplings join to the furthest limit of lines and afterward bolt or weld them together to frame a framework. Rib fittings are built out of either tempered steel, cast iron, aluminum, metal, bronze, or different materials. Rib fittings are utilized in plumbing, modern and development projects. They are regularly made of treated steel or other top notch materials like metal, bronze, or copper. Rib fittings are intended to associate lines that permit the free progression of water, gas, or oil.