This is a replacement part for the inexpensive Living Solutions Personal Blender sold by Walgreen's. Due to weakness in the nut trap, the coupler in this blender can fail when blending frozen foods, ice, or very thick fluids. Compared to the original coupler this part should be more reliable. The outer walls are extra thick for better adhesion between layers, while the nut trap is flanged instead of just having vertical walls prone to weakness at the corners. The SCAD file is included so the part can be customized for other blenders.