Metal hoses are known by many terms including stainless steel hose, stainless steel lines, braided steel hose, flex hose, steel hose, flexible metal hose, flexible steel hose, flex metal hoss, stainless steel lines, steel hoses, steel braided lines, flex line. These all refer to a hose with a metal liner that may or may not have a metal braided cover. The hose end fittings are welded onto your metal hoses. Metal hoses are helium leak tested. Flexible metal hoses are excellent high temperature hoses.