thin-wall conduit

thin-wall conduit

Electric conduit which has a wall thickness insufficient for providing threads; the ends are joined by couplings which slip over the ends and which are held in place by setscrews.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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* Thin-wall conduit, also known as EMT (electric metallic tubing), comes in inside diameters of 1/2" to 4"; 1/2" is most common.