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he GROHE Rapid SL 2-in-1 WC installation system (3894820A) is a high-performance concealed cistern and frame solution designed for modern wall-hung toilets in UK bathrooms. Engineered in Germany, this premium steel frame system delivers strength, reliability, and a sleek minimalist finish for contemporary bathroom designs.
With a 0.82m installation height, this self-supporting WC frame is ideal for low-profile installations in residential and commercial projects. It is suitable for both solid wall and stud wall applications, offering flexible installation options while ensuring maximum stability and long-term durability.
The system includes a pre-assembled cistern and mounting frame, significantly reducing installation time on site. GROHE’s dual flush technology (6L/3L) ensures efficient water usage, helping to reduce household consumption without compromising flushing performance.
Designed for wall-hung WC pans, the Rapid SL system conceals all plumbing behind the wall, leaving only the flush plate visible for a clean, modern bathroom aesthetic. It is compatible with a wide range of GROHE flush plates for customised design flexibility.
Built with a robust powder-coated steel frame tested to high load standards, this system ensures safe and secure installation every time. Ideal for bathroom renovations, new builds, and professional plumbing installations across the UK.
Key Features:
GROHE Rapid SL 2-in-1 concealed WC frame system
Product code: 3894820A
0.82m installation height for compact installations
Heavy-duty self-supporting steel frame construction
Dual flush cistern system (6L / 3L water saving)
Pre-assembled unit for faster installation
Suitable for wall-hung WC pans
Compatible with GROHE flush plates
Tested for high load stability and durability
Suitable for solid and stud wall installation
Concealed design for modern bathroom aesthetics
Perfect for UK bathrooms requiring a reliable, space-saving concealed toilet installation system with trusted GROHE engineering.
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Many of our items have free delivery and where next-day delivery is shown we will endeavour to achieve this, as long as the order is placed before 1pm (11am for Towel Rails), is within the UK mainland and subject to stock availability.
We will email you an estimated delivery date either on receipt of your order or once it is processed. Where tracking information is available we will send that too once the order is dispatched.
We are often able to deliver to addresses outside the United Kingdom - please contact us if this is required for us to check and provide a quote. Alternatively, you can arrange for a courier to collect from our premises.
Medium and large items incur a delivery charge. If more than one medium or large items are ordered only one delivery charge will be applied. This will be displayed in the basket during checkout. Medium items are £27.30 and large items are £49.99 (including VAT). The delivery charge for the largest products - eg wall panels and worktops and some heavy ceramic items and shower trays - is £59.99. Please note we are not making a profit from this - we are using delivery services that have a track record of not breaking items and passing on the cost that we are charged.
We want all our customers to be happy with their purchases. Returns may be made within 14 days of delivery for unwanted goods or 30 days for faulty goods.
Please inspect goods as soon as possible after delivery. Damaged items MUST be reported immediately - or at least within 3 days. Delays reporting damage make resolving the issue much more difficult.
Please either email us at [email protected] to let us know that you would like to make a return and why.
Please ensure that the goods returned are intact, unused and in the original undamaged packaging. Please be aware that some of our suppliers will ask for a restocking fee to accept returns. (Plumb-Warehouse will not charge a restocking fee - we will only pass on the supplier's fee).
For our full Delivery & Returns - please see here.
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