DU Dielectric Union Home » Products » DU Dielectric Union The Dielectric Union shall be rated for 250 psi (ANSI B 16.39). The body and nut shall be steel with galvanized coat, the gaskets shall be EPDM, the insulator shall be nylon, and the tailpiece shall be brass. Specification Sheet Catalog Catalog List Pricing Current Catalog: BEECO-2019 Technical Technical Reference Codes BEECO Backflow Cross Reference Chart: 2020 BEECO Repair Kit Cross Refernce BEECO Abbreviations Guide BEECO/Watts Reference Codes Return to Products