Air Check Valve - 911 | 1984-1998 99610622257 they are correct for the

they are correct for the earlier 356 models

Porsche Huf TPMS valve stem set for all models

Upgrade your ride and experience the benefits with this easy-to-install product

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Air Check Valve - 911 | 1984-1998 99610622257 they are correct for theAir Check Valve For Porsche 911 (1984 1989) 964 (1989 1994) 993 (1995 1998) Models. The Air Check Valve for Porsche 911 controls airflow within the engines vacuum system, preventing backflow and ensuring proper operation of emission controls. Built for a precise fit, it helps maintain engine efficiency and supports clean emissions. An essential component for preserving your Porsches performance and environmental compliance.