Geberit Delta Dual Flush - 109.105.00.1 The Geberit 120mm concealed cistern is designed for drywall applications, fully insulated against condensation and therefore recommended for part or room height installations, making them suitable for use with floor-standing WCs. Supplied with a front actuation, you can change factory settings to make an immediate post flush possible. Furthermore, this Delta concealed cistern has a rear or top centre water supply connection and includes a connection hose which can be attached on an angle stop valve tool-free. This unit offers two possible flush volumes that can be altered via factory settings. Note: Comes without a - you can purchase one separately (see available accessories) Key Features and Benefits: - Designed for drywall installations -.