Worcester Wall Seal 160Mm Black 87161112120

Worcester Seal 160mm

The Worcester Wall Seal (Part No. 87161112120) is a genuine OEM (Original Equipment Manufacturer) weatherproofing component used for the external termination of a boiler's flue system. This black rubber gasket, with a 160mm diameter, is designed to fit around the outer flue pipe where it exits through an external wall. Its primary function is to provide a neat, professional finish while preventing rainwater, wind, and debris from entering the cavity or the property through the flue core hole.

Key Features and Specifications
UV-Stabilized Rubber: Manufactured from high-quality black EPDM rubber that is resistant to ultraviolet light and extreme weather conditions, preventing it from cracking or perishing over time.

160mm Diameter: Specifically sized for use with standard Worcester Bosch 100mm concentric flue systems, providing the necessary coverage for a standard 125mm–150mm core-drilled hole.

Flexible Design: The "bellows" or "stepped" profile allows the seal to conform to uneven brickwork or textured exterior surfaces for a tighter fit.

Genuine Worcester Bosch Part: Ensures a perfect aesthetic match with other Worcester flue accessories and a secure friction-fit on the flue pipe.

Aesthetic Finish: Provides a clean, tapered look to the external flue terminal, hiding rough edges or masonry damage caused during drilling.

Application and Compatibility
This wall seal is a universal accessory for the majority of Worcester Greenstar appliances utilizing the 60/100mm flue system. It is commonly used with:

Greenstar i, Si, and CDi Combi models.

Greenstar Ri and i System boilers.

Standard Horizontal Flue Kits.

Technical Tip: While this seal provides an excellent weather barrier, it is best practice (and often a requirement) to apply a bead of translucent silicone sealant behind the rim before pressing it against the wall. This ensures a 100% watertight seal against porous brickwork or mortar lines.

Essential Companion Products
To ensure a complete and compliant flue installation, the following genuine Worcester parts are frequently used alongside the 160mm wall seal:

Internal Sealing: Worcester Exhaust Seal 59Dia – 8737711102

Hydraulic Maintenance: Worcester O-Ring – 87161138510

Gas-Side Integrity: Worcester Gas Valve Gasket – 871860034A0

Hardware: Worcester Retaining Nut – 87161066830

Ignition: Worcester Electrode Kit – 87161163810

Specialist Support and Local Collection
Is your current wall seal sagging, or was it never fitted during the original installation? A missing or damaged wall seal can lead to damp issues inside the wall cavity. Our trade counter team can provide you with the correct external and internal seals for your specific flue configuration.

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 and casing spares.