Bundy tube, steel tube, metal tube, tube pipe, hydraulic brakes Low carbon steel tube, bundy tube, copper tubing Standards: astm a254, sae j527. Type: double wall and single wall. Plated : yellow zinc, white zinc, copper and pvf. Length : available in coils, straight boom lengths, cut-to-length, or fabricated assemblies using: brake line, brake tube, brake pipe, fuel line, transmission line, air conditioning tube, condenser, compressor, evaporator etc. -