Black Gas Cap - Vented, Right Hand Thread Fits 1996-2021 Harley Davidson Big Twin and Sportster Models. Features: Gloss black Steel Gas Cap with Nylon threads and rubber seal. Feature a provision for evaporative emissions control equipment. These caps feature a pressure reflief valve that works with all Harley models. Ratchet Overrun Protection - No need to worry about over tightening these caps. Fits 1996-2019 Harley Davidson Big Twin and 1996-2019 Sporster Models. Dimensions: OD = 2 7/8" Height (Including Threads) = 2" Finish: Black Fitment: Fits 1996-2019 Harley Davidson Big Twin and 1996-2019 Sporster Models.