Hello, metal hose is a joint, pipe blank, and net cover welded assemblyOutside is a net cover, in fact, the inside is the same as the household washing machine drain pipe shape. So watertight.
Other answerThe metal hose is a joint, pipe, and net cover welded assembly. Professional or professional person you find a better answer for you. As a professional thing to professional people
Metal hose as a connecting part of the pipeline is not allowed to leak, do not know you, why do you want to ask?
