Patent ID: 8640411

Claim:
A cap block for capping two back-to-back walls formed of wall blocks, the cap block having top and bottom faces bounded by two opposed side faces and two opposed end faces and having a rectangular shape when viewed from above the top face, the bottom face having two grooves that extend lengthwise in a side-to-side direction of the cap block from one side face to the other side face, the two grooves being spaced apart a preselected distance from one another in an end-to-end direction of the cap block so that the cap block can be positioned atop and cap two back-to-back walls of wall blocks with each groove receiving therein protuberances that protrude upwardly from top faces of uppermost wall blocks of respective ones of the two walls, and the two grooves each having two opposed sidewalls that extend inwardly from the bottom face and terminate at a bottom wall, the two opposed sidewalls having the same shape and configuration throughout their extent from the bottom face to the bottom wall.