When Von Duprin discontinued the PS873 power supply and the add-on boards associated with that power supply. Command Access developed a replacement board manufactured with similar characteristics to PS871-2 board. The new VD2-872 board mounts to the PS873 in the same fashion as the factory original PS871-2 board. After the success of the VD2-873, we developed the VD2-914 replacement relay board that fits and functions just the same as the original factory 2RS board for the Von Duprin PS914, with the added addition of a .5A power tap. Whether it be old or new style, we got you covered.