This hose is constructed EPDM tube and cover with two spiral layers of reinforcement .
SAE20R3 D1&D2 is a Heater Hose ,SAE 20R4 D1is a radiator hose .both are intended to operate in the rang -40to+125.
long service life since hoses can withstand the abuse of corrosive additives ,ozone and abrasion .supplied in both saight and custom formed shapes.
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