Whether for home farm builder or industrial customers National has all the right hardware in the sizes and finishes you need..With over a century of service National is committed to maintaining the highest level of product quality innovation and manufacturing technology.
For DWV applications gradual sloping DWV fittings must be used.It is easy to install and has better sound deadening qualities than PVC Schedule 40 DWV Foam Core. PVC Schedule 40 is highly durable with high tensile and impact strength.