This OEM Secondary Air System (SAS) Valve, also known as a PAIR valve or secondary air switching solenoid, is manufactured by Denso for Aprilia motorcycles. It electronically controls fresh-air flow from the airbox to the cylinder-head exhaust ports, helping burn remaining fuel vapors in the exhaust system to reduce emissions and support Euro 5 / Euro 5+ compliance. Key Features OEM Part Number: 857181 Manufacturer: Denso Type: SAS / PAIR valve secondary air solenoid Construction: Heat-resistant molded plastic housing with internal magnetic coil actuator Hose Ports: Dual-port design for airbox inlet and reed-valve outlet routing Mounting: Integrated rubber isolation tab helps reduce vibration Marking: Factory casting number 45H 9376 Fitment Aprilia RSV4 1000 / 1100: 2009–2026 Aprilia Tuono V4 1000 / 1100: 2011–2026 Aprilia RS 660: 2020–2026 Aprilia Tuono 660 / Factory: 2021–2026 Aprilia Tuareg 660: 2022–2026
Please verify compatibility with your specific motorcycle model before purchasing.
Cleaning Status
partially_cleaned
Cleaning Notes
Used anti rust
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Yes, all parts with OEM numbers are genuine manufacturer parts. Check the specifications tab for the OEM number.
We offer a 30-day return policy. Items must be in original condition. See the Shipping tab for complete details.
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Parts are sold separately. We recommend professional installation for safety and warranty purposes.
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