Worcester Bosch O-Ring 87102050290

The Worcester Bosch 87102050290 is an O-ring used as a sealing component inside Worcester Bosch gas appliances. It sits at a joint or connection point within the unit, where it compresses to form a watertight or airtight barrier and helps the appliance maintain reliable, leak-free operation. It is listed under the O-rings and lip seals spare part category and is used across the Worcester Bosch Greenstar range, including combi and condensing models.

• Water weeping or tracking from the joint the O-ring seals
• Visible flattening, hardening or cracking of the ring when the joint is opened
• Scale or debris build-up on the sealing face causing a poor seal
• Repeated pressure loss or air ingress traced to a sealed connection
• Damp staining or corrosion around the affected joint

• Check the GC number and appliance serial number against the compatibility list to confirm the correct fitment.
• Note the alternative number 1012351 and previous number DD97904404 when cross-referencing older documentation.
• Inspect the surrounding joint and sealing faces; replace any other worn seals at the same time if the assembly is being opened.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.