Attributes . Appleton(TM) and O-Z/Gedney(TM) Offer Neer(TM) Rn Zinc Offset Nipples and Tpc Three Piece Couplings. the Rn Provides An Offset Connection Between Two Outlet Boxes Or Enclosures. the Tpc Provides Threaded Coupling Between Lengths Of Rigid Conduit and Imc Conduit Elbows, Where Neither Can Be Rotated. . Names