Cools hoses fail from the inside out. This phenomenon is known as electrochemical degradation, or ECD. It occurs because the hose, liquid coolant and engine/radiator fittings form a galvanic cell or "battery". This creates a chemical reaction which causes micro-cracks to form in the hose tube.
Coolant seeps into these cracks or stryations and begins to break down the reinforcement. This leads to hose failure and ultimately roadside breakdowns.
Features:
Recommend for upper, lower, by-pass, heater and other coolant hose applications Heat and ozone resistant cover Engineered to resist electrochemical degradation - the leading cause of hose failure SAE 20R4 and 20R3 Type EC Class D-1 and D-2 specifications Temperature rating: -40° C to 135° C in coolant hose applications Caution: Do not use for fuel or oil transfer applications