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IAPMO PS 066-2015
Dielectric Fittings
This standard covers insulated, dielectric fittings with male threads, grooved ends, or plain ends, intended to reduce galvanic corrosion in plumbing systems by isolating dissimilar metal piping sections, and specifies requirements for materials, physical characteristics, performance testing, and markings.
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International Association of Plumbing and Mechanical Officials [iapmo]