1.dual push button Dia.38mm and Dia.16mm for option (with adapter ring); 2. Overflow pipe heigh could be adjustable Detailed product Description1.Dual flush valve2.1.5'',2''3.For one piece or two piece toilets4.Cable control5,Overflow pipe adjustable6,Silicon seal is free from leak7,Half and full flush volume can be adjusted by moving up and down8,OEM is welcome DescriptionWire-control dual flush ...