system for preventing a wasserschadens with- a wandscheibe (10), a first connector (16) for connection to a water supply and a second port (18) for connection to a valve which, with the wandscheibe (10) for mounting within a wall (14) such that a gap is provided to a inner surface (38) of the wall (14) is- a sheathing (36), with the wandscheibe (10) doors, so that the second connector (18) surrounds and from the inside (38) of the wall (14) hervorsteht and- dichtmitteln for establishing a seal between wandscheibe (10) and the sheathing (36).
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