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UL 514B: Liquid Tight Flexible Metal Conduit Fitting Liquid Tight Metal Conduit Fitting S53 series is certified by UL laboratory according to UL514B and Canadian CSA-C22.2 No.56 standard. S53 series metal fittings are applied on the relay or end point of wiring system to connect metal conduits, junction box or enclosure for wiring extension and protection. The body is made of zinc alloy with RoHS compliance. The fitting is fixed to the junction