The coupling for wedge coupling Ø 19, is an essential piece in the installation of cabinet boards where a precise splice is required, avoiding their uncoupling. Its manufacture has been made in black plastic and it is obtained in packages of 2,500 units. The design of this piece is created to work with the Support for coupling and the Expansion tip for wedge coupling Ø 19. It is provided with a plastic screw in its rear area and is circular in its front part, it has two splice flaps that closely engage with the support allowing a precise installation free of unwanted movements.