Grohe Inspection Shaft for Small Flush Plates — 66791000
The Grohe 66791000 is an authentic roughing-in inspection shaft and plaster guard designed specifically for installing small-size Grohe actuation plates (130 mm x 172 mm). When fitting compact "S" series plates — such as the Skate Cosmopolitan S, Arena Cosmopolitan S, or Nova Cosmopolitan S — the standard factory-supplied revision box is too large and will leave visible gaps behind the smaller plate. This genuine Grohe reduction shaft provides the precise opening dimensions and secure mounting points required for a clean, flush-to-wall finish during tiling and final installation.
Identification Guide:
MPN: 66791000 (66 791 000) | Item: Small Inspection Shaft / Protection Box | Material: Moulded ABS / Polypropylene | Plate Compatibility: Small Size Plates (130 x 172 mm)
Key Features
- Essential Size Reduction: Replaces the standard large inspection shaft to prevent the tiled wall opening from exceeding the dimensions of compact plates.
- Plaster & Tiling Guard: Shields the pneumatic cistern components, drop valve, and internal pipework from dust, grout, and wet plaster during roughing-in.
- Trimmable Depth: Manufactured with pre-scored ribs so it can be trimmed flush to the finished tile face regardless of wall cladding thickness.
- Integrated Fastening: Provides the correct mounting points and clips to secure small-format magnetic and mechanical sub-frames.
Compatibility & Installation Notes
Cistern Compatibility: Designed for Grohe Rapid SL and Uniset 1.13 m concealed frames equipped with the GD 2 cistern.
When is this required?
• Required For: All small "S" Grohe flush plates measuring 130 mm x 172 mm (e.g. Skate Cosmopolitan S 37535, Arena Cosmopolitan S 37624, Nova Cosmopolitan S 37601).
• Not Needed For: Standard full-size Grohe flush plates measuring 156 mm x 197 mm (such as the standard 38732 Skate Cosmopolitan series), which use the factory-supplied standard shaft.