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Bosch 87161064450 Air Vent Valve Features:
- Air vent valve for Bosch combi boilers.
- Purges trapped air from the boiler hydraulic circuit during heating cycles.
- Prevents gurgling noise, cold spots, poor circulation, and premature pump wear.
- Knurled top cap threads down to hold system pressure and backs off to open the bleed port.
- Hand-operated venting with no tools required during commissioning or after topping up.
- One-piece molded heat-resistant polymer housing resists corrosion and scale better than metal.
- Includes a new rubber O-ring for a watertight seal against the boiler manifold.
- Alternate part number 8-716-106-445-0.
Fits These Bosch Models:
- KWB28-3.
- KWB35-3.
- KWB42-3.
Additional Features:
The Bosch 87161064450 is an air vent valve for combi boilers, fitted at the high point of the hydraulic circuit where it purges air that collects in the system and works its way out of the water during heating cycles. Left in place, that trapped air causes gurgling, cold spots across the heat exchanger, reduced circulation and accelerated pump wear, so the valve vents it continuously as the boiler runs and as the system is refilled after a service or a drain down. Central to how it operates is the knurled cap on the top of the housing, which threads down against the seat to hold system pressure and backs off by hand to open a small bleed port, giving an installer direct manual control over venting during commissioning or after topping up without needing tools. The valve is molded from a single piece of heat-resistant polymer that stands up to corrosion and scale better than metal alternatives, and it ships with a fresh rubber O-ring so the joint seals watertight against the boiler manifold on installation rather than relying on a compressed original gasket.