Worcester Bosch Automatic Air Vent (AAV) 87161064450

Genuine Worcester Bosch OEM auto air vent for popular Greenstar and CDi boilers, including the latest Greenstar 8000 Life & Style ranges. The AAV uses a float mechanism to release trapped air from the system, helping prevent noise, airlocks and pressure issues.

• Manufacturer: Worcester Bosch
• Part type: Automatic Air Vent (AAV)
• MPN: 87161064450
• GTIN / EAN: 4010009876076
• Fitted location: Pump/primary circuit assembly (varies by model)

Compatible boilers (examples)

Used across a wide range of Worcester appliances (model/year dependent). Common fits include:

• Greenstar i / i System / i Junior (e.g. 24i, 28i), Si (25Si, 30Si), CDi Classic/Compact Combi & System
• Greenstar 8000 Life & Style families

Tip: Many trade listings also show extensive compatibility grids for CDi 25/30/35/40 and Greenstar i System sizes (12i/15i/18i/24i). Always confirm against your boiler data plate/parts manual for MPN 87161064450.

What this part does

The auto air vent continually purges air from the sealed system. A float inside the vent rises on water and drops when air accumulates, opening the vent to release air and then resealing once water returns.

When to replace

• Persistent air in radiators / gurgling noises despite bleeding
• Visible seepage from the vent cap or body
• System pressure/flow issues traced to trapped air

What’s in the box

• 1 Worcester Bosch automatic air vent 87161064450