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Molded Coolant Hose

Our molded coolant hoses are manufactured to fit specific applications with OEM-quality specifications, saving you time, costs, and energy from going to your OE dealer for radiator hose replacements.

  • Temperature: -40°C to 135°C (-40°F to 275°F)
  • Recommended for upper, lower, by-pass, heater and other coolant hose applications
  • Approved for marine applications
  • Note: Gates recommends replacing hose clamps each time a new coolant hose is installed

All Parts

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Part # Product # Description Max W.P. (psi) Max W.P. (bar) Hose I.D. (in) Hose I.D. (mm) Hose O.D. (in) Hose O.D. (mm) Vac. (inHg) MBR (in) Wt. Per ft Len. (ft)
20046 42610046 20046 GATR 1.75 44 1.2
20065 42610065 20065 GATR 1.5 38 0.66
20088 42610088 20088 GATR 1.5 38 0.93
20121 42610121 HOSE CH GATR 20121 1.5 38 1.03
20137 42610137 20137 GATR 1.25 32 0.77
20145 42610145 20145 GATR 1.75 44 1.06
20151 42610151 20151 MOLDED COOLANT HOSE 1.75 44 0.45
20157 42610157 HOSE CH GATR 20157 1.06 27 0.44
20166 42610166 20166 MOLDED COOLANT HOSE 1.5 38 0.83
20168 42610168 20168 GATR 1.56 40 1.13
1-10 of 2821 Items

Eliminating ECD.

When creating our FleetRunner™ Coolant Hose, we wanted to tackle the leading cause of hose failure: electrochemical degradation or ECD. This occurs when the hose, liquid coolant, and engine/radiator fittings form a galvanic cell or "battery," creating a chemical reaction that allows micro-cracks to form in the hose tube. Coolant seeps into these cracks or striations and breaks down the reinforcement, leading to hose failure and, ultimately, roadside breakdowns.

We worked to engineer our EPDM coolant hose material compound with superior electrochemical resistance, so your Gates® coolant hoses will last longer and keep your engine systems running stronger.

Features and Benefits

  • Meets SAE 20R3 EC Class D1 under 25mm (1") ID, SAE 20R4 EC Class D1 for 25mm (1") ID and over
  • EPDM tube, synthetic fiber knit reinforcement, heat- and ozone-resistant EPDM cover
  • Engineered to resist electrochemical degradation - the leading cause of hose failure
  • Custom shapes available with minimum order quantity and setup charge
  • Specifically engineered materials resist vacuum collapse to reduce the need for internal springs in many applications


For a secure fit to virtually every vehicle on the road today, Gates® precision-manufactures our molded engine hoses with exclusively-developed factory processes to ensure compatibility and exceptional performance to specific vehicle manufacturer specifications.