Econo Rail Fuel Cell FeaturesNot SFI-certified*3 or 4-gallon capacityUnique shape designed for dragstersAircraft-style flush mount cap assemblySeamless rotomolded cross-linked polyethylene outer shellAvailable with black or natural shellAvailable with or without aviation safety foamOne -8AN outlet fittingOne -6AN vent fitting*All JAZ fuel cells exceed SFI Spec 28.1, but only those labeled "This fuel cell carries SFI certification" are actually certified.