Review on 🔒 [2 Pack] RKX Gas Cap Replacement Seal Fuel for Volkswagen Audi VW mk4 mk5 mk6 B5 b6 b7 b8 Petrol - Superior Quality and Easy Installation by Carlos Deuschle

Fits perfectly to the existing original Audi tank cap. I didn't want to buy an OEC to avoid inconsistencies, so I replaced the O-ring instead. I took out the old ring and compared the thickness of the two and noticed a significant difference in thickness. Old after 10+ decreased in thickness by about 30% as expected. Installing a new ring gave the cap the required thickness and improved tightness in the gas tank. See photos of the old and new ring. There is a very noticeable difference in thickness.