for control switches item no.: 506 KOU, 502 KOU, 503 KOU, 506-20 KOU, 502-20 KOU, for touch control switches item no.: 506 KOTU, 502 KOTU, for illuminated buttons item no.: 531 U, 533 U, 533-2 U, 534 U, IP 44 installation only possible in triple frames!, Installation note: No plaster compensation possible. Insert must be installed flush with the wall. The support ring must not be wallpapered over.