The Worcester Bosch 77161922050 Washer Fibre Pack is a genuine replacement sealing accessory designed to provide reliable, high-temperature sealing within your gas combi or gas system boiler. Made from quality fibre materials, this washer pack helps ensure gas- and water-tight joints at critical connection points, supporting safe combustion, efficient heat transfer and long-term system integrity. Proper sealing prevents leaks that can lead to pressure loss, reduced performance or safety faults.

This washer fibre pack is compatible with Worcester Bosch gas combi and gas system boilers that specify part number 77161922050 in their installation and parts documentation. To confirm correct compatibility, always match the number on your existing washer or consult your boiler’s service manual before installation, as the correct sealing solution depends on specific joint design and application.

Supplied as a set, the 77161922050 Washer Fibre Pack includes the necessary fibre washers for use at designated flanges and connections, allowing straightforward replacement during routine servicing, component repair or system overhaul. Choosing this genuine Worcester Bosch sealing pack helps maintain reliable, leak-free operation in compatible gas combi and gas system boilers.