This Febi Bilstein seal ring is designed for coolant hose applications. It is a single unit and is compatible with VW vehicles. The part number is 100991. Key features include OE Matching Quality and Precision Fit. The product is made of NBR (nitrile butadiene rubber) and has an outer diameter of 46 mm, a thickness of 4 mm, and an inner diameter of 38 mm. It weighs 0.002 kg. Please ensure the product is installed by a competent individual. The product is supplied without fitting instructions. Cross-references include AJUSA16087300, DR.MOTOR AUTOMOTIVE DRM03338, FEBEST 23400-035, SWAG 30 10 0991, TOPRAN 119 259, WILMINK GROUP WG1752098, and zentparts Z08168. This product is also compatible with Audi A8 D3, D4 (02 to 18) with OEM reference 4E0121666 and Audi A4 B7, B8, B9 (04 to 18).