R = 3;r = 1;ParametricPlot3D[{Cos[u]*(R + r Cos@[v]), Sin[u]*(R + r Cos@[v]), r*Sin[v]}, {u, 0, 6}, {v, 0, 6}]
R is the distance from center of torus to tube center. r is the radius of the tube. u controls the torus sweep. v controls the tube's profile sweep.