Dixon® Rigid Coupling, 5-Style Lightweight, Series: R Series, Coupling, 8 in Nominal, Grooved, 2-21/64 in Thickness, 13-25/32 in Length, 175 psi, Ductile Iron, 70°F Dixon® R78 R Series 5-Style Lightweight Rigid Coupling with EPDM Gasket, 8 in Nominal, Grooved End Style, Ductile Iron