Disclosed is a concealed plumbing fixture including a connection member that is provided with at least one connection for a water pipe, especially a domestic cold water pipe and/or a domestic warm water pipe, and at least one fastening element for fixing the connecting member in a mounting hole. Said plumbing fixture further includes a functional unit, particularly with a plumbing valve that is provided with connection means for creating a water connection to complementary connecting means of the connecting member, and a joining device that allows the functional unit to be removably fixed to the connecting member. The connecting member is preferably provided with an adjustable fastening device by means of which the same can be fixed in the mounting hole at different mounting depths. The inventive plumbing fixture also includes at least one fastening ring that can be moved in an axial direction along the connecting member as well as at least one means for locking the fastening ring on the connecting member.