Honval Valve Co., Ltd. has been improved a serial sensingflush-meters for toilet and urinal; this innovation hasbeen obtained US. Pat. Their features are no wearingtrouble valve inside construction without any part will rubeach other, when flushing open or close. It can less thetrouble occur, offers a durable and long service life.Multi-protected function include all the valve controlpassage inside are multi-protected, to prevent being causetrouble. Push button can directly drive one flushing foreasy push, no need of battery power. 
Taiwan