Radium Fuel Rail Plumbing Kit w/FilterThese optional fuel hanger plumbing kits include a filter, hose, fittings, hardware, etc. They add the necessary post pump filtration required when using the Radium Engineering fuel pump hanger. An 8AN PTFE feed line routes from the Radium hanger up to the Radium fuel filter mounted under the vehicle. From the filter, an 8AN rubber hose is supplied to go to the fuel rails. A 6AN rubber return hose is included that routes fuel from the fuel pressure