The Worcester Bosch 87161405530 CDi diaphragm replacement kit is a genuine OEM service kit specifically engineered to refresh the flexible diaphragm components used in hydraulic control and diverter valve assemblies in compatible Worcester Bosch CDi series boilers. Over time, diaphragms and related seals can harden, crack or lose elasticity due to heat and system pressure, which may lead to inconsistent water routing, reduced hot water/central heating switching performance or boiler fault conditions. This replacement kit provides properly specified diaphragms and sealing elements that restore smooth and accurate valve actuation, helping return the boiler’s hydraulic control to reliable operation.

This diaphragm replacement kit is compatible with selected Worcester Bosch CDi boilers that list part number 87161405530 for diaphragm servicing. Because configuration and parts application can vary by model and production year, it’s recommended to confirm suitability using your boiler’s exact model number and GC number before ordering.

Key features of the Worcester Bosch 87161405530 CDi diaphragm replacement kit include genuine Worcester Bosch manufacture for assured quality and fit, precision-formed diaphragms and seals engineered for long-term durability under routine heating system stresses, support for restoring consistent diverter and hydraulic control performance, reduction of pressure-related faults and valve response issues, and dependable service life when installed by a qualified Gas Safe heating engineer as part of maintenance or