Extension Set Compatible with GROHE 14048000 Rapido SmartBox

GROHE Rapido SmartBox Extension Set – Carbon Fiber Nylon 3D-Printed Extenders, 98 mm and 74 mm

Universal Custom Extension Kit for GROHE Rapido SmartBox, Grohtherm SmartControl and SmartControl Concealed Mixer Installations

A durable, adjustable extension solution designed for situations where a GROHE Rapido SmartBox has been installed too deeply inside the wall and the standard factory extension is too short.

This custom-made kit includes four high-quality 3D-printed extension components manufactured from strong carbon-fiber-reinforced nylon. Each extender can be cut to the exact required length directly during installation, helping the installer compensate for different wall depths, tile thicknesses and installation conditions.

The parts are supplied longer than normally required so that they can be accurately shortened on site.

Kit Contents

The complete set includes

• 1 × long carbon-fiber-reinforced nylon extender — approximately 98 mm
• 3 × shorter carbon-fiber-reinforced nylon extenders — approximately 74 mm each

The larger 98 mm component contains internal grooves extending approximately 75 mm into the part.

Only the parts specifically shown and described in the product listing are included. Screws, mixer components, original GROHE parts, tools and installation accessories are not included unless expressly stated otherwise.

Key Benefits

• Designed for deeply recessed GROHE Rapido SmartBox installations
• Can be cut to the exact required installation length
• Helps compensate for additional plaster, tile, adhesive or wall-panel thickness
• Carbon-fiber-filled nylon construction
• Strong, rigid and durable material
• Resistant to normal bathroom humidity
• Custom 3D model designed as a practical replacement solution
• Suitable for professional adjustment directly on site
• Reduces the risk of ordering an extender that is too short
• Supplied as a universal, adjustable-length set

Adjustable Length

Important: these components are intentionally supplied longer than required.

The installer must measure the necessary extension length and cut each component to size before final installation.

The parts can normally be shortened using an angle grinder, rotary cutting tool, fine-tooth saw or another suitable cutting tool. After cutting, all edges should be carefully cleaned, deburred and inspected before installation.

The ability to shorten the components on site makes the set suitable for a wider range of installation depths and helps prevent mistakes caused by ordering a fixed-length extension.

Compatibility

This extension kit is designed for use with compatible installations involving:

• GROHE Rapido SmartBox
• GROHE Rapido SmartBox Universal Rough-In Box
• GROHE Grohtherm SmartControl
• GROHE SmartControl concealed mixer systems
• Compatible concealed shower mixer and thermostat installations using the relevant SmartBox configuration

Compatibility can vary depending on the exact mixer model, production version, installation depth and original components already installed.

Before ordering, carefully compare

• The shape of your existing parts
• Groove position and profile
• Connection points
• Required quantity
• Installation depth
• Dimensions shown in the product images
• Your exact GROHE mixer or trim model

Do not order solely based on the GROHE or SmartBox name. Different models and installation configurations may use different internal components.

Installation Instructions

Installation should preferably be performed by a qualified plumber, bathroom installer or other competent professional.

Recommended procedure

1. Remove the external trim according to the manufacturer’s instructions.
2. Measure the exact missing extension length using a digital or mechanical caliper.
3. Record the required length for every individual component.
4. Mark each extender before cutting.
5. Cut the components to the required length.
6. Carefully deburr and clean all cut surfaces.
7. Check the orientation and alignment of the grooves.
8. Perform a careful visual comparison before insertion.
9. Install each component slowly and evenly.
10. Complete the final mixer assembly according to the original equipment manufacturer’s installation instructions.
11. Test the complete installation for correct operation before closing or sealing the work area.

Critical Installation Warning

Measure first and install only after the parts have been cut to the correct length.

Do not repeatedly insert and remove the uncut components while testing the required depth. Repeated insertion, removal, twisting or forced installation can damage smaller details, grooves or connection features.

For the safest installation

• Measure with a caliper
• Cut accurately
• Check the orientation
• Install carefully
• Avoid repeated test fitting
• Never force a component into position
• Stop immediately if excessive resistance is felt

Once correctly measured, cut and installed, the components are designed to hold the required connections securely and provide reliable long-term service under normal installation conditions.

Important Information About 3D-Printed Parts

These are custom-manufactured 3D-printed replacement parts. They are not injection-moulded original GROHE components.

Due to the nature of additive manufacturing, minor visible layer lines, surface texture, colour variation, support marks or small dimensional variations may be present. These characteristics are normal for functional 3D-printed parts and are not necessarily defects.

Minor adjustment may occasionally be required during installation. This can include:

• Light sanding
• Deburring
• Trimming a small area
• Cleaning internal grooves
• Slightly adjusting an edge or contact surface

Such minor finishing work does not normally affect the intended function or durability of the component.

Dimensions may be subject to normal 3D-printing and post-processing tolerances.

Material

The components are manufactured from carbon-fiber-reinforced nylon selected for its combination of strength, rigidity and durability.

Material properties can be affected by installation conditions, temperature, chemicals, mechanical stress, prolonged UV exposure and improper fitting. The parts must not be exposed to open flame, uncontrolled heat or aggressive chemicals.

These components must not be used for any purpose other than their intended mechanical extension function within a compatible installation.

Before Ordering

Please carefully inspect your existing installation and compare it with all product photographs and dimensions before placing an order.

The buyer is responsible for confirming

• Compatibility with the exact mixer system
• Correct component shape
• Required dimensions
• Required extension length
• Installation depth
• Installation method
• Suitability for the intended application

Contact us before ordering when there is any uncertainty. Supplying clear photographs of the existing components, the GROHE product number and the required dimensions will help us evaluate possible compatibility.

Returns and Modified Parts

The components must be inspected before cutting, sanding, drilling, grinding, gluing, installing or otherwise modifying them.

Parts that have been cut, installed, damaged, contaminated or modified may have reduced or no return eligibility, except where mandatory consumer rights or applicable law require otherwise.

Custom-made, personalised or made-to-order products may also be subject to return limitations under applicable consumer legislation.

Nothing in this policy limits any non-waivable statutory consumer rights.

Safety and Professional Installation Disclaimer

Incorrect measurement, cutting or installation may damage

• The extension components
• The original mixer mechanism
• The SmartBox
• Decorative trim
• Tiles or wall finishes
• Internal plumbing components

The seller is not responsible for damage caused by incorrect measurements, unsuitable tools, forced installation, excessive tightening, incorrect orientation, incompatible models, unauthorised modification or installation contrary to the original manufacturer’s instructions.

Installation must comply with applicable plumbing regulations, building requirements and the original equipment manufacturer’s instructions.

Before completing the installation, the installer must verify that the mixer operates correctly and that there are no leaks, abnormal resistance or alignment problems.

Independent Replacement Product and Trademark Notice

This is an independently designed and manufactured aftermarket replacement product.

It is not an original GROHE product and is not manufactured, authorised, sponsored, approved or endorsed by GROHE.

The GROHE, Rapido SmartBox, Grohtherm and SmartControl names are used only to identify the intended compatibility and application of the replacement parts.

All trademarks, product names and brand names remain the property of their respective owners.

Product Summary

This carbon-fiber-reinforced nylon extension set provides a practical solution for GROHE Rapido SmartBox installations positioned too deeply inside a finished wall.

Because the components are supplied in extended lengths and can be cut directly on site, the installer can adapt them to the actual wall and tile thickness instead of relying on a single fixed extension length.

For best results, measure accurately, cut each part before installation and avoid repeated insertion and removal.

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Frequently Asked Questions

Are these original GROHE parts?

No. These are independently designed and manufactured aftermarket 3D-printed replacement parts.

What is included in the set?

The set includes one approximately 98 mm extender and three approximately 74 mm extenders.

Can the parts be shortened?

Yes. The parts are intentionally supplied longer so they can be cut to the required length during installation.

Why are the extenders supplied so long?

SmartBox installation depth can vary depending on plaster, adhesive, tiles, wall panels and the original box position. The additional length allows the installer to create a precise custom fit.

Can I test-fit the parts before cutting?

Repeated insertion and removal is not recommended. Measure the required length with a caliper, cut the parts accurately and install them carefully after preparation.

Will the parts fit every GROHE SmartBox installation?

No universal aftermarket part can be guaranteed to fit every model and installation configuration. Compare your components with the photographs, measurements and connection design before ordering.

Are 3D-printing lines normal?

Yes. Visible layer lines and minor surface differences are normal characteristics of functional 3D-printed components.

Can minor adjustments be required?

Yes. Light sanding, trimming, deburring, or groove cleaning may occasionally be necessary.

Should the parts be installed by a professional?

Professional installation is strongly recommended, particularly where the concealed mixer, plumbing system or finished wall could be damaged by incorrect installation.