Product: 33 mm bouchon / clapet admission (swirl flap plug) — replacement for swirl flap delete kits and intake flap caps Key benefits Restores sealed intake: replaces damaged or missing bouchon/clapet admission to prevent air leaks and unmetered intake flow. Protects the turbo and engine: stops broken swirl flaps or debris from entering the intake tract, reducing risk of turbo and intake damage. Durable, directfit solution: designed as a 33 mm replacement plug compatible with common BMW diesel swirl flap delete kits and M57 applications for reliable longterm use. Simplifies swirl flap delete or : usable as a direct replacement when performing a swirl flap delete or when replacing original intake flap caps. Important attributes Function: intake swirl flap cap / bouchon clapet admission — seals the intake runner where the swirl flap actuator is removed or replaced. Size: 33 mm (designed for 33 mm swirl flap openings). Material: suitable for aluminum swirl flap delete configurations (durable and corrosionresistant for intake use). Performance: provides a tight seal and stable mounting surface, compatible with swirl flap delete kits and replacement bouchon/clapet solutions. Compatibility note: intended for BMW diesel models and M57 engine variants that use 33 mm swirl flap caps. Compatibility (as specified) 530d E60 X5 35d (33 mm) X5 2011 3.0 L E93 330d X6 3.5 X3 (swirl flap / bouchon clapet admission replacement) 335d (works with aluminum swirl flap delete configurations) General compatibility with M57 engine intake applications that use a 33 mm bouchon/clapet admission Practical use scenarios 1) Swirl flap delete: While performing a swirl flap delete on a 530d E60 or X5 35d, install this 33 mm bouchon to permanently seal the intake passage and complete the delete kit. 2) after flap failure: If a swirl flap has broken in an E93 330d and the original clapet or bouchon admission is damaged, use this direct replacement plug to reseal the intake quickly and prevent debris ingestion. 3) Routine maintenance or gasket replacement: When servicing an X5 2011 3.0 L or other M57equipped BMW, worn intake caps and gaskets with this 33 mm bouchon to restore proper sealing and airflow control. Installation and fit Designed for direct replacement in the listed models and for use with aluminum swirl flap delete kits. Confirm the 33 mm size and intake flange shape on your vehicle before installation. Compatible with M57type intake configurations; may require standard tools for removal of the old flap cap and securing the replacement. What this product solves Eliminates intake leaks caused by missing or damaged flap caps. Prevents loose swirl flap parts from entering the intake and damaging the turbo or engine. Completes a swirl flap delete job with a correctly sized, durable plug. Note Verify the 33 mm measurement and vehicle model compatibility prior to to ensure correct fit.