Profile: E C C O Mfg. is a supplier of sheet metal products. Our products include residential & commercial pipe, duct, fittings, chimney liners, round and flat oval spiral duct, aluminum flexible duct & fittings, louvers and dampers. We offer round duct for bonded tendon, couplers for duct, grout caps, transitions, metal strand caps and plastic rebar chairs for post-tensioning industries.