Reinforced Silicone: These couplings features high temperature 5-Ply reinforced silicone material which meet or exceed SAEJ20 Standard. Coupler Hoses: Allow for expansion, movement, and extreme vibration between two hard pipes while reducing the possibility of connections coming apart or having your hard pipes or other equipment break. Note: This coupling kit fits aFe intercooler tubes only (46-20124-B)