fire sleeve

Check with your local auto parts stores that have a hose shop (more of a local shop not chains) they have some cheaper fire sleeve the kind im using is called Dixion Valve.
Bob
 
Ralph, there are several different types of industrial firesleeve, in different colors. Most all pass the exposure tests. The aviation rated firesleeve (AS1072)
allows those assemblies to meet the TSO conformance qualifications of the FAA. Industrial firesleeve works well, as an alternative to the Mil-Spec versions. Generally, they are made by the same companies, so the quality is good.
However you choose to do it, just be sure to protect the FWF hoses.
Tom