The Grohe Senner WC interior set with soft-close toilet seat is a comprehensive wall-mounted toilet installation system designed for concealed installation in frame walls. This complete set includes a durable steel frame construction that offers superior strength compared to plastic or aluminum alternatives, with a maximum load capacity of 400 kg. The system features a 3/6-liter flush stop mechanism with an efficient start-stop function for water savings. Key dimensions include frame measurements of 50 cm in width, 113-133 cm in height, and 13-23 cm in depth, as well as toilet bowl dimensions of 36.8 cm in width, 53.1 cm in depth, and 42 cm in height. The package dimensions are 115.15 cm in width, 61.2 cm in height, and 55.5 cm in length, with a gross weight of 31.75 kg. The soft-close toilet seat ensures quiet, gentle closing and is particularly suitable for households with children. The system has four connection points at the back of the tank, allowing for right or left-side installations. Additional features include the ability to connect condensate water from air conditioning or ventilation systems to the toilet tank, tool-free component assembly, and EasyConnect technology for simplified connection of flush buttons and valves using flexible hoses. The set comes complete with a frame, mounting hardware, Arena Cosmopolitan control panel, toilet ceramics, soft-close seat, and sound insulation mat. This installation system is designed for bathroom and toilet applications, providing a reliable and durable solution for modern sanitary installations.