Enjoy this deal on the Delta 81T231HWA-38 TECK H2Optics Exposed Flush Valve, 1 gpf, 3/4" Top Spud, No Field Adjust, 11.5" Length, No Field Adjust with the experts at PlumbersStock. H2Optics is the name of Delta's proprietary electronic sensor-operated flushing technology. This TECK auto flush urinal valve will improve hygiene in your restroom. This flush valve will provide years of reliable operation, and it's easy to install. Delta stands by its products with their focus on design, innovation, and functionality.