This report presents the results of a three-dimensional finite element analysis of a 45 degree lateral (Model 4 of an earlier Phase I Program with geometric parameters d/D = 0.5 and D/T = 40, and a stress ratio s/S = 1.0).A half symmetry model generated earlier under Phase I of the PVRC Long Range Program on Laterals was used in the present analysis.In the Phase I model, the finite element mesh consisted of 2208 eight node isoparametric solid elements.Except for the branch pipe, three or more layers of finite elements were used through the thickness of the entire model.Critical zones of the crotch regions were modeled using five elements through the thickness in the acute region and six elements in the obtuse region.