The Ideal Standard ProSys is a concealed cistern for wall-mounted toilets, equipped with an 80-millimeter front wall mounting module that can be placed in front of masonry walls or lightweight drywall constructions. This self-supporting system is secured to the floor with two fixed support feet and features a painted steel frame with a robust construction tested for loads up to 400 kilograms. With a minimum installation depth of 90 millimeters and front operation via the EasyFix system, it allows for easy and quick installation for wall-mounted toilets with center distances of 180 or 230 millimeters. The polypropylene cistern has an anti-condensation coating and allows for maintenance without special tools. Compatible with mechanical, pneumatic, or electronic control panels, it offers a dual flush with factory-set 6/3 liters and optional adjustments to 4/2, 6/3, or 7/3 liter settings. The SmartValve water-saving technology can reduce water consumption by up to 9 liters per day and can be combined with the SmartFlush hygiene flushing system. The unit includes a rubber lip seal with a 45-millimeter diameter, a drain elbow, and adapters for 90/110 millimeters, as well as protective covers for complete installation readiness.