Wireways are designed to protect cables from environmental contaminants such as dust, dirt, oil, and moisture. Wireways—sometimes known as "troughs" or "gutters" within the electrical contracting field—are commonly used to control wiring in environments where contaminants may cause problems. Depending on the product type, they can be mounted to walls or ceilings, secured under flooring, or laid out in a hybrid design in unique cable management systems. HW-MR Middle Reducer is one of the Hesheng wire way components , used to connect two straight through with the different size separately. Construction of H.S.Wireway: ·Wireway body and cover are fabricated from code gauge steel ·Wireway body has mounting holes on the back ·Wireway is available with or without knockouts on the top and bottom sides ·Wireway fittings have no knockouts, ends are available with or without knockouts ·Wireway has cover which are attached with formed hinges on one side