AA Thread's Polyethylene Encasement, or Polywrap, has been proven to be just as effective as other corrosion protection methods for ductile iron pipe at a fraction of the cost. This is due to the fact that it is installed at the job site by the contractor with no special training required. Polywrap does not deteriorate once installed under the ground and will protect pipeline from exterior corrosion for years to come. Polywrap can be low or high density and comes in a variety of sizes, thicknesses and colors for specific applications.
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