Dayco cooling system hoses feature knitted reinforcement, a synthetic EPDM rubber construction for high strength performance, protection against abrasion, and resistance to oil, mud, salt, road debris, ozone and coolants. They can also withstand temperature variations from -40°F (-40°C) to +257°F (+125°C). The inner base is reinforced with knitted rayon for maximum strength and burst resistance. In addition to meeting SAE J20R4, Class D-1 requirements, this hose also meets Type EC electro-chemical requirements as specified in SAE J1684, which prevents inner deterioration caused by the build-up of static electric charges.