CTA, 38mm O.D., Oil Filling Adapter, CTA-7473, Red The CTA 7473 Oil Filling Adapter simplifies oil changes on a wide range of European vehicles, including Audi, Volkswagen, BMW, Mercedes-Benz, Volvo, and Porsche Cayenne and Panamera models. This adapter features a bayonet fitting and a 38mm outer diameter working end, ensuring a spill-free oil filling process that saves time and reduces mess. It is designed for use with CTA's 2-liter funnel (7471) or similar funnels and is often included in comprehensive oil funnel kits.