Grohe Rapido SmartBox extension set for single lever bath and shower mixers - 14056000 | REUTER
GROHE Rapido SmartBox Universal Rough-In Box 35601000 - The Home Depot
GROHE Rapido SmartBox: Installation video - YouTube
GROHE SmartControl - Concealed Mixer for Shower or Bath (2 Valves, Square Shape, Set for Final Installation for GROHE Rapido SmartBox, Push for ON-OFF, Turn for Volume Adjustment), Chrome, 29148001