aFe POWER replacement coupling kits feature high temperature 5-Ply polyester reinforced silicone material which meet or exceed SAEJ20 Standard. These durable couplings allow for expansion, movement, and extreme vibration between two hard pipes while reducing the possibility of a failed joint or seal. This coupling kit fits aFe POWER items 46-20239-B, 46-20229-B/R, and 46-20222-B.