Gates 12103 Molded Heater Hose 5/8" to 3/4" Dual I.D. EPDM

The Gates 12103 is a factory-molded heater hose engineered for OE-quality performance in automotive cooling systems. This dual inside diameter hose features a 5/8-inch inlet transitioning to a 3/4-inch outlet, with a 22-5/8 inch centerline length designed to fit modern compact engine compartments.

Key Features:

• EPDM tube construction with synthetic fiber knit reinforcement and EPDM cover
• Engineered to resist electrochemical degradation (ECD), the leading cause of hose failure
• Temperature range: -40°F to 275°F (-40°C to 135°C)
• Meets SAE 20R3 Type EC Class D-1 and D-2 specifications
• Approved for coolant, water, air, and marine applications
• Resists water permeation for extended service life

This precision-molded hose provides a direct OE-style replacement that eliminates the need for extensive curved hose inventory. Gates recommends replacing hose clamps when installing new coolant hoses. Not for use with fuel or oil applications.