Concealed Cistern Frame GROHE Rapid SL 38526000 for wall-hung WC, single pack

The GROHE Rapid SL concealed cistern frame (model 38526000) is a built-in support system designed for mounting a wall-hung WC and its flushing cistern inside a stud or masonry wall. Supplied as a single pack, the frame provides a stable carrier for the toilet bowl and integrates the in-wall cistern to enable a minimalist, flush-mounted bathroom finish. The system is intended for installation where the cistern and carrier are recessed, allowing for a compact visible profile and easier cleaning of the bathroom floor area.

Advantages

The frame offers a robust, corrosion-resistant steel construction that secures wall-hung toilets and supports typical loads encountered in residential and commercial bathrooms. Its preassembled design reduces installation time and includes adjustable feet and fixing points to ensure correct height and alignment. Integration with standard flush plates and concealed cistern technology allows for reliable water delivery and discreet operation while maintaining access for maintenance from the front.

Suitable for

• New-build and renovation projects requiring a wall-hung WC with a concealed cistern
• Bathrooms where a flush-mounted, minimalist aesthetic is desired
• Installations that require a stable carrier for ceramic wall-hung toilet bowls
• Applications where floor-level cleaning and accessible bathroom layout are priorities

Key specifications

• Built-in carrier frame for wall-hung WC and concealed cistern
• Steel construction designed for stable load-bearing capacity
• Adjustable mounting height and depth for alignment with finished wall
• Front access for service and maintenance of cistern components
• Compatibility with standard flush plates and wall-hung toilet bowls

How to use

Install the GROHE Rapid SL frame inside a suitable wall structure following local building regulations and the manufacturer’s installation instructions. Secure the frame to the floor and wall using the provided fixing points, then adjust height and alignment so the toilet bowl will be positioned correctly after finishing the wall surface. Connect the water supply and waste outlet according to plumbing standards, mount the cistern components within the frame, and attach the wall-hung WC to the carrier bolts. Complete the installation by fitting the chosen flush plate and testing the flushing and refill functions prior to closing the wall finish.

Usage recommendations

Use with wall-hung toilets that match the specified carrier bolt spacing and weight capacity. Verify compatibility of the chosen flush plate and ensure access for future maintenance by keeping the flush plate removable. Follow local plumbing codes and recommended installation practices to ensure secure mounting and reliable operation.