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C629-668 12" x 8" Reducer Coupling that is used in large diameter piping systems with a lower required pressure rating. Class 125 fittings are socket fittings that are suited to handle everything that schedule 40 fittings handle except for the pressure. Class 125 fittings are suited to handle pressures up to 125 PSI as well as temperatures up to 140 degrees F. These fittings are a more economical way to get the job done if your system does not require a higher pressure fitting. PVC Pipe Supplies stocks these fittings nationwide and offers low discounted prices to all of our valued customers on these fittings.