Parker Super Flex Fuel Line 1/2" Hose/per Foot FL5004:1 Design factor. Parker SuperFlex bio fuel compatible fuel line, up to and including B100. SuperFlex features a Nylon liner, meets or exceeds SAE 30R7 specifiions and is California Air Resourced Board (CARB) compliant. 100PSI pressure rating. 1/2 in. line sold by the foot. Series 3970X.