Introduction
This instruction manual provides essential information for the proper installation, operation, and maintenance of your COMAP Sirius Toilet Bowl Supply, model S279421. This product is a rubber gasket designed for Sirius No. 3 toilet bowls with a 34 cm diameter, ensuring a reliable seal for the flushing mechanism. Please read this manual thoroughly before installation and keep it for future reference.
Safety Information
- Always turn off the water supply to the toilet before beginning any installation or maintenance work.
- Wear appropriate personal protective equipment, such as gloves, to prevent contact with water or cleaning agents.
- Ensure all connections are secure to prevent leaks.
- Keep small parts away from children to avoid choking hazards.
Package Contents
The COMAP Sirius Toilet Bowl Supply S279421 package includes:
- 1 x COMAP Sirius Toilet Bowl Supply (Rubber Gasket)

Image: Packaging for the COMAP Sirius Toilet Bowl Supply S279421, showing the product name in French and a barcode.
Setup and Installation
This gasket is designed for the Sirius No. 3 toilet bowl with a 34 cm diameter. Follow these steps for proper installation:
- Turn off Water Supply: Locate the water shut-off valve behind or near the toilet and turn it clockwise until the water flow stops completely.
- Drain the Toilet: Flush the toilet to empty the tank and bowl as much as possible. Use a sponge or towel to remove any remaining water from the tank.
- Remove Old Gasket (if applicable): If replacing an existing gasket, carefully disconnect the toilet tank from the bowl (this may involve unscrewing bolts from underneath the bowl). Remove the old, worn-out gasket from the flush valve assembly.
- Clean Surfaces: Clean the surfaces where the new gasket will sit on both the flush valve and the toilet bowl to ensure a proper seal. Remove any residue or debris.
- Install New Gasket: Place the new COMAP Sirius Toilet Bowl Supply gasket onto the flush valve assembly. Ensure it is seated correctly and evenly.

Image: The black rubber gasket of the COMAP Sirius Toilet Bowl Supply, designed for a secure seal.
- Reassemble Toilet: Carefully place the toilet tank back onto the bowl, aligning the bolts with the holes. Tighten the nuts underneath the bowl evenly until the tank is secure, but do not overtighten, as this can crack the porcelain.
- Restore Water Supply: Slowly turn the water shut-off valve counter-clockwise to restore the water supply to the toilet.
- Check for Leaks: Allow the tank to fill and then flush the toilet several times. Carefully inspect around the base of the tank and the connections for any signs of water leaks. If leaks occur, slightly tighten the tank bolts or re-seat the gasket.
Operating Instructions
The COMAP Sirius Toilet Bowl Supply gasket operates passively as part of your toilet's flushing mechanism. Once correctly installed, it forms a watertight seal between the toilet tank and the bowl, allowing the flush valve to function efficiently. No specific user operation is required for the gasket itself beyond its initial installation.
Maintenance
To ensure the longevity and proper function of your COMAP Sirius Toilet Bowl Supply gasket:
- Regular Inspection: Periodically check for any signs of wear, cracking, or hardening of the rubber gasket.
- Cleaning: If the gasket becomes dirty, gently clean it with mild soap and water. Avoid harsh chemicals that could degrade the rubber.
- Replacement: If you notice persistent leaks between the tank and bowl, or if the gasket appears damaged, it should be replaced with a new COMAP Sirius Toilet Bowl Supply S279421.
Troubleshooting
Issue: Water leaking between the toilet tank and bowl.
Possible Causes:
- Gasket is not seated correctly.
- Tank bolts are not tightened evenly or sufficiently.
- Gasket is old, worn, or damaged.
Solutions:
- Turn off the water supply and drain the tank. Re-seat the gasket, ensuring it is flat and properly aligned.
- Evenly tighten the tank bolts. Do not overtighten.
- If the gasket is visibly damaged or old, replace it with a new COMAP Sirius Toilet Bowl Supply S279421.
Specifications
| Model Name | JOINT |
| Brand | Comap |
| Manufacturer Part Number | S279421 |
| Item Type Name | Sirius No. 3 Toilet Bowl Supply for Cistern, Toilet and Toilet - Diameter 34 |
| Main Material | Rubber |
| Unit Count | 1 Count |
| Item Dimensions (L x W x H) | 11 x 8 x 3 centimetres |
| Global Trade Identification Number (GTIN) | 3356772794218 |
| ASIN | B07JH2HJS1 |
| Country of Origin | France |
Warranty
The COMAP Sirius Toilet Bowl Supply S279421 comes with a 2-year warranty from the date of purchase. This warranty covers manufacturing defects under normal use. Please retain your proof of purchase for any warranty claims. The warranty does not cover damage resulting from improper installation, misuse, or normal wear and tear.
Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact COMAP customer support. Refer to the product packaging or the official COMAP website for the most current contact information.