1. Product Overview
The Duravit Starck 3 Cistern, model 0920400004, is a white porcelain toilet tank designed for use with compatible toilet systems. It features a single flush mechanism operated by a side lever and is equipped with a 3-inch flapper valve. This cistern is intended for floor-mounted installation and includes a bottom left supply connection.

Figure 1: Front view of the Duravit Starck 3 Cistern.
Key Features:
- Single flush mechanism for efficient water usage.
- Convenient side lever for flush activation.
- Equipped with a durable 3-inch flapper valve.
- Designed for bottom left water supply connection.
2. Setup and Installation
This section provides general guidelines for the installation of the Duravit Starck 3 Cistern. Professional installation by a qualified plumber is recommended to ensure proper function and compliance with local plumbing codes.
Pre-Installation Checklist:
- Ensure all necessary plumbing connections are available, specifically a bottom left water supply.
- Verify compatibility with your existing or new toilet bowl.
- Inspect the cistern for any visible damage prior to installation.
- Gather required tools (e.g., wrenches, sealant, level).
Installation Steps (General):
- Prepare the Area: Turn off the main water supply and drain any remaining water from the existing toilet system if replacing.
- Position the Cistern: Carefully place the cistern onto the toilet bowl, ensuring the gasket aligns correctly with the flush valve opening.
- Secure the Cistern: Use the provided bolts and washers to securely fasten the cistern to the toilet bowl. Do not overtighten to avoid cracking the porcelain.
- Connect Water Supply: Attach the water supply line to the bottom left inlet of the cistern. Use appropriate sealant or plumber's tape to ensure a watertight connection.
- Install Internal Components: Ensure the fill valve and flapper valve are correctly seated and connected according to the manufacturer's instructions.
- Test for Leaks: Slowly turn on the water supply and allow the cistern to fill. Check all connections for leaks. Flush the toilet several times to verify proper operation and check for any leaks during flushing.

Figure 2: Duravit Starck 3 Cistern installed as part of a complete toilet unit.
3. Operating Instructions
The Duravit Starck 3 Cistern operates with a simple single flush mechanism.
Flushing the Toilet:
- To activate the flush, gently press down on the side lever located on the cistern.
- Hold the lever down briefly until the water begins to drain from the bowl.
- Release the lever, and the cistern will automatically refill to its designated water level.
Important: Do not force the lever. If the flush mechanism feels stiff or does not operate correctly, refer to the Troubleshooting section.
4. Maintenance
Regular maintenance ensures the longevity and efficient operation of your Duravit Starck 3 Cistern.
Cleaning:
- Clean the exterior of the cistern with a soft cloth and mild, non-abrasive cleaning agents.
- Avoid harsh chemicals, abrasive cleaners, or scouring pads, as these can damage the porcelain finish.
- For internal cleaning, periodically remove the cistern lid and inspect for mineral buildup or debris. Use a toilet brush or non-abrasive sponge with a mild cleaner if necessary.
Component Inspection:
- Flapper Valve: Periodically check the 3-inch flapper valve for wear, cracks, or stiffness. A worn flapper can cause slow leaks.
- Fill Valve: Ensure the fill valve is operating correctly, filling the tank to the appropriate water level and shutting off completely.
- Water Supply Line: Inspect the water supply line and connections for any signs of leaks or corrosion.
Note: If replacing internal components, use genuine Duravit parts or compatible replacements to ensure proper function.
5. Troubleshooting
This section addresses common issues you might encounter with your Duravit Starck 3 Cistern.
| Problem | Possible Cause | Solution |
|---|---|---|
| Cistern leaks slowly or continuously runs. |
|
|
| Weak or incomplete flush. |
|
|
| Cistern takes too long to fill. |
|
|
If these troubleshooting steps do not resolve the issue, it is recommended to contact a qualified plumber or Duravit customer support.
6. Specifications
| Brand | Duravit |
| Model Number | 0920400004 |
| Product Name | Starck 3 Cistern |
| Color | White |
| Material | Porcelain |
| Product Dimensions (D x W x H) | 7.13" x 14.63" x 7.13" |
| Item Weight | 13.8 Kilograms (30.4 pounds) |
| Installation Type | Floor Mounted |
| Water Supply Connection | Bottom Left |
| Flush Mechanism | Single Flush with Side Lever |
| Flapper Valve Size | 3 inches |
7. Warranty and Support
For specific warranty information regarding your Duravit Starck 3 Cistern, please refer to the documentation provided at the time of purchase or visit the official Duravit website.
Should you require technical assistance, replacement parts, or have questions not covered in this manual, please contact Duravit customer support through their official channels.
Duravit Official Website: www.duravit.us (Example link, actual link may vary by region)





