Delta 81T231HWA-19 Delta 81T231HWA-19 Commercial Hard wire flush valve. Delta Commercial Hard Wire Flush Valve. This flush valve is for 3/4" top inlet Urinals only. Supply line can be installed on the left or right side, maximum height for installation is 13", and is equipped with quiet action, Teck exposed Hard Wire operated diaphragm. The Entire flush valve is built to be is high use location, and is finished Chrome. Sensor, Conduit, and lens window are all designed to be scratch and vandal resistant.