This flat base gasket is intended for a brass siphon for bidet or washbasin like Valentin washbasin brass traps ref 1303/1413. It guarantees the seal between the base and the body of the siphon. Its external diameter of 54.8 mm and internal diameter of 50 mm, for a total thickness of 3 mm. The installation is very easy.
This flat seal does not require specific maintenance and is very resistant. In black elastomer, this spare part is sold in sets of 2 units.