The Vaillant 0020231436 Lip Seal is a genuine replacement sealing component designed to provide a secure, two-lip seal around a 60 mm diameter connection in your boiler’s flue or combustion assembly. The dual-lip design offers enhanced sealing performance by preventing the escape of combustion gases and ensuring airtight joints, which helps maintain correct draft conditions, supports efficient combustion and protects internal components from heat and flue gas ingress. A worn or damaged lip seal can lead to leakage, poor performance or fault codes, so fitting the correct OEM seal is essential for reliable operation.

This lip seal is compatible with Vaillant boilers or flue systems that specify part number 0020231436 in their technical documentation. To ensure proper fitment and dependable sealing performance, always verify the part number on your existing seal or consult your boiler’s service information before installation, as sealing components and diameters vary between models and configurations.

Supplied ready for direct replacement, the 0020231436 Lip Seal installs into the designated joint when fitted by a qualified engineer. Choosing this genuine Vaillant component helps restore proper sealing integrity, supports safe and efficient combustion airflow and contributes to dependable performance in compatible systems.