Hardtop Gasket 911 1999 2012 2307660124 and a more refined driving 93010610207 and a more refined driving experience Features and Benefits:Reduces the oil blow by from the crank ventilationKeeps the oil in the engine while still allowing good crank ventilationVery simple mounting sandwiches between the crankcase and ventilation the lid breather coverUsed on all Hastech race & street enginesRecommended for all aircooled Porsche 911 engines to help reduce oil consumption caused by ingestion of oil laden air into the intake caused by excess crankcase windage and blow by Manufactured to OEM specifications for a perfect fit and reliable performance This essential component creates a weathertight seal between your hardtop and vehicle frame