Extremely durable EPDM synthetic rubber liner tube and cover (ethylene propylene diene monomer) 2-ply fabric reinforced for engine coolant water, air conditioning, and other mid-pressure water applications Resistant to coolants, heat, cold, ozone, saltwater Rated to 50 psi (0.34 Mpa) Temperature rated to +212F (100 C) SAE J20R3 Black with yellow letters 2-year warranty