Royal 139 ESS WB 璐易 139 ESS WB is a sensor flush valve produced by Sloan. It is suitable for rear-entry squatting toilets. The product has low noise, concealed type, diaphragm structure and other features, and is equipped with a PERMEX™ synthetic rubber diaphragm with double filtration device and a quantitative bypass hole, a OPTIMA® EL-1500-L infrared adaptive sensor with indicator light, 3-second delay flushing function, Courtesy Flush™ backup manual flushing button, trigger solenoid valve, 9〞x 11.6〞(238mmx298mm) stainless steel panel, 1〞 Watts pipe standard handwheel adjustable check valve, length adjustable connecting pipe, bend head with two active interfaces, high copper content low zinc content anti-dezincification copper alloy, CID™ technology, PERMEX™ synthetic rubber diaphragm filtering structure, angle valve and vacuum check valve.