Worcester O Ring 87161138510

Worcester Dia 33mm Suitable for hydraulics of Greenstar and Greenstar ERP boilers.

The Worcester O-Ring (Part No. 87161138510) is a genuine OEM (Original Equipment Manufacturer) hydraulic seal designed for the internal pipework and manifold assemblies of Worcester Bosch Greenstar boilers. This precision-engineered rubber ring provides a watertight seal at high-pressure connection points, preventing internal leaks that could otherwise damage sensitive electrical components or cause the boiler to lose pressure.

Key Features and Specifications
High-Grade Synthetic Rubber: Manufactured from EPDM or a similar heat-stabilized elastomer that resists the effects of central heating additives and constant thermal expansion.

Precision Dimensions: Specifically sized to fit Worcester's "push-fit" hydraulic connectors, ensuring a snug and permanent seal.

Genuine Worcester Bosch Part: Guarantees the correct shore hardness to provide a robust seal without tearing during installation.

Pressure Resistance: Built to handle the standard domestic operating pressure and the thermal stresses of the primary heating circuit.

Leak Prevention: Acts as a vital barrier in the hydraulic block, ensuring system stability and protecting the boiler chassis from corrosion.

Boiler Compatibility
This O-ring is a common spare part across a wide variety of Worcester Greenstar appliances. Compatible models include:

Greenstar CDi (Classic & Highflow): 25CDi, 30CDi, 35CDi, 40CDi, 42CDi.

Greenstar i Junior: 24i Junior, 28i Junior.

Greenstar Si: 25Si, 30Si.

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

Greenstar Heatslave: Various oil-fired combi models.

Technical Tip: When replacing an O-ring, always ensure the receiving groove is cleaned of any debris or limescale. Applying a small amount of WRAS-approved silicone grease will help the connection slide together smoothly and prevent the O-ring from twisting or pinching.

Essential Companion Products
To ensure a professional and secure hydraulic repair, the following genuine Worcester parts are frequently checked or replaced alongside this O-ring:

Alternative Hydraulic Seal: Worcester O-ring – 87161138330

Hydraulic Block Seal: Worcester Seal – 87101031910

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

Hardware: Worcester Retaining Nut – 87161066830

Flow Management: Worcester Flow Turbine Adapter – 8716122264

Specialist Support and Local Collection
Are you seeing a small drip from a pipe connection or experiencing a slow drop in system pressure? Our trade counter team can help you identify exactly which O-ring size is required for your specific manifold or pipework.

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