Gates 21305 Premium Molded Coolant Hose

The Gates 21305 Premium Molded Coolant Hose is a precision-engineered replacement hose designed to meet OEM-quality specifications for upper, lower, bypass, heater, and other engine coolant applications. This pre-shaped molded hose ensures a perfect fit and sealed connection, eliminating the time and expense of sourcing parts from dealerships.

Key Features:

• Engineered to resist electrochemical degradation (ECD), the leading cause of coolant hose failure
• EPDM tube with synthetic fiber knit reinforcement and heat- and ozone-resistant EPDM cover
• Pre-molded shape for precise fit and perfectly sealed conditions
• Temperature range: -40°F to +275°F (-40°C to +135°C)
• Meets SAE 20R3 EC Class D1 or SAE 20R4 EC Class D1 standards depending on size
• Approved for marine applications
• Resistant to heat, ozone, and chemical coolants

Gates molded coolant hoses feature advanced EPDM compounds that resist the electrochemical degradation that occurs when hose, coolant, and metal fittings form a galvanic cell. This resistance to micro-cracking and coolant seepage ensures longer service life and reliable cooling system performance. Gates recommends replacing hose clamps when installing new coolant hoses for optimal sealing.