Gates Small I.D. Molded Coolant Hose is factory-molded OEM style hose to fit todayΓÇÖs smaller tighter-fitting engine compartments. Can be used for coolant water and air applications. Approved for marine applications. Similar to OEM specifications. Has all the quality features of Gates Molded Coolant Hose. Engineered to resist electrochemical degradation - the leading cause of hose failure. Inside diameters range from 1/4ΓÇ¥ to 1ΓÇ¥. Meets SAE 20R3 type EC Class D-1 and D-2 specifications. Temperature rating: -40A F to 275A F (-40A C to 135A C) in coolant hose applications. Note: Gates recommends replacing standard worm drive and spring loaded clamps with Gates PowerGrip(R) SB Clamps each time a new coolant hose is installed. Gates - Driven By Possibility