1. Introduction
Thank you for choosing the Geberit 300 Basic Toilet Seat with Lid. This manual provides essential information for the safe and correct installation, operation, and maintenance of your new toilet seat. Please read these instructions carefully before beginning installation and retain them for future reference.

Figure 1: Geberit 300 Basic Toilet Seat with Lid. This image shows the Geberit 300 Basic Toilet Seat with Lid in white, featuring its D-shaped design.
2. Safety Information
- Always ensure the toilet bowl is clean and dry before installation.
- Do not use abrasive cleaners or harsh chemicals on the toilet seat, as this may damage the material.
- Avoid standing on the toilet seat or lid, as this can cause damage or injury.
- Keep small parts out of reach of children during installation.
- If any parts are missing or damaged, do not proceed with installation. Contact customer support.
3. Package Contents
Please check that all components are present before beginning installation:
- Geberit 300 Basic Toilet Seat
- Geberit 300 Basic Toilet Lid
- Mounting Hardware (bolts, washers, nuts)
4. Setup and Installation
Follow these steps to install your Geberit 300 Basic Toilet Seat:
- Prepare the Toilet Bowl: Ensure the toilet bowl's mounting holes are clean and free of debris. If replacing an old seat, remove it completely.
- Position the Mounting Hardware: Insert the bolts through the mounting holes on the toilet bowl.
- Attach the Seat: Place the toilet seat onto the bolts, aligning the seat's hinge points with the bolts.
- Secure the Seat: From underneath the toilet bowl, place washers onto the bolts, followed by the nuts. Hand-tighten the nuts initially.
- Adjust Alignment: Adjust the position of the seat to ensure it is centered and aligned with the toilet bowl.
- Final Tightening: Once aligned, fully tighten the nuts. Do not overtighten, as this can damage the ceramic or the seat.
Refer to the diagrams below for product dimensions to ensure compatibility with your toilet bowl:

Figure 2: Top View Dimensions. A technical drawing illustrating the top-down view of the toilet seat, indicating a width of 370mm and a length of 445mm.

Figure 3: Side View Dimensions. A technical drawing illustrating the side profile of the toilet seat, showing a height of approximately 5mm for the lid.
5. Operating Instructions
The Geberit 300 Basic Toilet Seat is designed for straightforward use:
- To use the toilet, simply lift the lid and then the seat.
- After use, gently lower the seat and then the lid.
6. Maintenance and Cleaning
Proper maintenance ensures the longevity and hygiene of your toilet seat:
- Regular Cleaning: Clean the toilet seat regularly with a mild soap solution and a soft cloth.
- Avoid Harsh Chemicals: Do not use abrasive cleaners, scouring pads, or strong chemical detergents, as these can scratch or discolor the plastic surface.
- Drying: Always dry the seat thoroughly after cleaning to prevent water spots and maintain hygiene.
- Hinge Care: Periodically check the hinge connections for tightness. If the seat feels loose, gently retighten the mounting nuts.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Toilet seat is loose. | Mounting nuts are not tight enough. | Retighten the mounting nuts underneath the toilet bowl. Do not overtighten. |
| Seat appears misaligned. | Seat was not properly centered during installation. | Loosen the mounting nuts slightly, adjust the seat position, then retighten. |
| Scratches or discoloration on the seat. | Use of abrasive cleaners or harsh chemicals. | Use only mild soap and a soft cloth for cleaning. Damage from harsh chemicals is typically irreversible. |
8. Specifications
| Brand: | Geberit |
| Model: | S8H51203000G |
| Product Dimensions (L x W x H): | 44.5 cm x 37 cm x 2.51 cm (approximate, based on product data) |
| Material: | Plastic |
| Color: | White |
| Shape: | D-shaped |
| Manufacturer Reference: | S8H51203000G |
9. Warranty and Support
For warranty information or technical support, please refer to the official Geberit website or contact your local Geberit dealer. Please have your model number (S8H51203000G) available when contacting support.
Manufacturer: Geberit
Date of Availability on Amazon.com.be: November 8, 2021





