Grohe 25mm Extension Set for 2-Handle Thermostats — 14058000
The Grohe 14058000 is an authentic, factory-original 25mm universal extension set engineered specifically for Grohe 2-handle thermostatic trim sets installed on the Grohe Rapido SmartBox universal rough-in body (35600000 / 35604000). If the rough-in box has been chased or tiled too deeply into the wall cavity, the outer control handles, splines, and escutcheon plate will not engage properly. This genuine extension set extends the internal spindle shafts, diverter headwork reach, and escutcheon mountings by an additional 25mm, providing a perfect fit without having to break into finished tilework.
Identification Guide:
MPN: 14058000 (also referenced as 14 058 000) | EAN / Barcode: 4005176484391 | Extension Length: 25 mm | Valve System: Grohe Rapido SmartBox (35600000 / 35604000) | Trim Type: 2-Handle Thermostatic Mixer Trim Sets
Key Features
- Solves Deep Wall Cavities: Adds 25mm of reach when the concealed Rapido SmartBox sits too far behind the finished tiled wall.
- Maintains Full Functionality: Precision-milled internal spindle extensions preserve calibrated temperature adjustment and diverter control.
- Saves Time & Wall Retiling: Corrects installation depth errors directly from the front face of the valve without destructive building work.
- Factory Precision Fit: Authentic Grohe OEM parts guarantee exact spline alignment, reliable O-ring seal compression, and secure faceplate mounting.
Installation Note
Always isolate incoming hot and cold water supplies before installation. The extension components attach directly between the inner cartridge sleeves of the Rapido SmartBox and the external 2-handle trim hardware. After fitting the spindle extensions and sleeves, test the 38°C safety stop position with a digital thermometer to ensure the temperature handle is calibrated accurately before final plate fixing.
Confirmed Model Compatibility
Engineered for Grohe 2-handle thermostatic trims mounted to the Rapido SmartBox universal rough-in body (35600000 / 35604000):
- Grohtherm 2-Handle Concealed Thermostats: 24075000, 24076000, 24077000, 24078000, 24079000, 24080000, 24153000, 24154000 (Dual function / 2-way diverter models across round and square styles).
- Grohe Atrio 2-Handle Thermostats: 24135003, 24138003.
- Grohe Allure Brilliant & Plus 2-Handle Trims: 24071000, 24072000, 24073000.
- Grohe Lineare & Essence 2-Handle Thermostats: 24095001, 24109001.
- Universal Rough-In Body: Grohe Rapido SmartBox (35600000 / 35604000).
- Please note: This extension is designed specifically for 2-handle rotary thermostatic trims on the SmartBox. It does not fit SmartControl push-button trims (which require 14048000), single-lever mixer trims (which require 14056000/14057000), or older Rapido T 35500000 valves (which use 47111000).