Reinforced Silicone This intercooler hose is constructed from high temperature 5 - Ply reinforced silicone material which meet or exceed SAEJ20 Standard. It uses built - in metal spiral insert to withstand extreme amounts of boost pressure while keeping from expanding. Durable Coupling Allow for expansion, movement, and extreme vibration between two hard pipes while reducing the possibility of connections coming apart or having your hard pipe or other equipment break. This coupling kit fits aFe intercooler with tube (46 - 20242 - B) only.