Worcester Seal Exhaust 59Dia 2X 8737711102

was 87110043210

The Worcester Exhaust Seal (Part No. 8737711102) is a genuine OEM safety component designed for the flue gas assembly of Worcester Bosch Greenstar boilers. This high-temperature seal, featuring a 59mm diameter, is positioned within the exhaust manifold to ensure a gas-tight connection between the boiler's internal flue pipe and the external flue system. Its role is critical: it prevents dangerous products of combustion (flue gases) from leaking into the boiler casing or the property.

This part is often sold as a single unit but is frequently replaced in pairs or as a "2x" set during major flue or heat exchanger maintenance to ensure total system integrity.

Key Features and Specifications
High-Temperature Resistance: Manufactured from a specialized rubber compound that maintains its elasticity and sealing properties under extreme thermal stress.

Corrosion Proof: Specifically treated to resist the acidic condensate found in modern condensing flue systems, preventing the material from perishing.

Precision 59mm Fit: Designed for the DN 60 (60mm) nominal inner flue pipe common to Worcester's standard concentric flue systems.

Genuine Worcester Bosch Part: Guarantees compliance with Gas Safety (Installation and Use) Regulations and maintains the integrity of the boiler's room-sealed design.

Safety Essential: A primary defense against Carbon Monoxide (CO) leakage within the appliance.

Boiler Compatibility
This exhaust seal is a universal component within the flue manifolds of many Worcester Greenstar models, including:

Greenstar i (Combi & System): 24i, 25i, 30i, 25Si, 30Si.

Greenstar CDi (Classic & Compact): 27CDi, 30CDi, 37CDi, 42CDi.

Greenstar Ri: 12Ri, 15Ri, 18Ri, 24Ri.

Greenstar 2000 & 4000: The latest generation of Worcester appliances.

Important Safety Note: As this component is part of the flue system, it MUST be installed and tested by a Gas Safe Registered engineer. During any flue work, a "flue integrity test" (combustion analysis) is required to ensure no leakage is occurring.

Essential Companion Products
To ensure a complete and safe flue or manifold service, the following genuine Worcester parts are frequently required alongside the exhaust seal:

Ignition & Sensing: Worcester Electrode Kit - 87161163810

Gas Sealing: Worcester Gas Valve Gasket - 871860034A0

Secondary Gas Seal: Worcester Gas Valve Gasket - 87161068000

Specialist Support and Local Collection
Are you seeing signs of moisture inside your boiler casing or suspect a flue leak? Our trade counter team can assist your engineer in identifying the correct quantity of seals required for your specific manifold type.

Visit our trade counter and Bathroom Showroom at 61 Fullers Road, E18 2QB for expert technical advice and immediate access to genuine Worcester Bosch flue spares.