(Defect of the ventricular septum), enlarged approx. 3 times, in SOMSO-Plast. The most common defect of the ventricular septum is in the so-called membranous septum, i.e. in the upper part of the ventricular septum under the tricuspid valve. In one piece, removable from base. Height: 18 cm., width: 12 cm., depth: 14 cm., weight: 450 g.