The Worcester Bosch 87155058250 Membrane is a genuine replacement diaphragm designed for use within the expansion or pressure control components of your Greenstar boiler’s hydraulic system. This flexible membrane responds to changes in water pressure, allowing the expansion vessel or associated assemblies to absorb pressure fluctuations and maintain stable system performance. A healthy membrane helps reduce pressure spikes, supports consistent central heating flow and helps prevent unnecessary boiler lockouts or component stress caused by pressure irregularities.

This membrane is compatible with Worcester Bosch Greenstar series boilers that specify part number 87155058250 in their parts documentation. To ensure correct fitment and reliable operation, always verify the part number on your existing membrane or consult your boiler’s service information before installation, as membrane types and vessel designs can vary between models and system configurations.

Supplied ready for installation, the 87155058250 Membrane integrates directly with the corresponding expansion or pressure control assembly when fitted by a qualified engineer. Choosing this genuine Worcester Bosch component helps restore proper pressure management and supports dependable performance in compatible Greenstar boilers.