3.75" Silicone Hose Elbow (black) High quality made to withstand high pressures and extreme temperatures. Made from Silicone rubber with a smooth wipe down finish They have a temperature range from -50F to 338F degrees, and a thickness range of 4mm to 6mm with three to four mesh Polyester or Nomex layers to withstand high temperatures and pressure better than rubber hose Resistant to a variety of automotive chemicals.