For straight connections in wet exhaust systems or engine water circulation. Black heavy walled synthetic rubber with 2 plies of synthetic cord, no imbedded wire. Resistant to engine heat, exhaust fumes, ozone, mild chemicals, antifreeze and salt water. Meets SAE J2006 Type R1 requirements including double ozone resistance required by SAEJ2006. Temperature ranges from -20°F - +200°F continuous, +250°F intermittent.