Thomas & Betts 5385 5IN STR INSUL LT CONNECTOR IRON

The 5385 is a 5 inch straight liquidtight connector, so it terminates 5 inch liquidtight flexible metal conduit. It is one of the largest trade sizes made in this style, typically used on large motor feeders and service runs rather than branch circuits.

Yes. The 5385 is an insulated-throat fitting, built in malleable iron with an insulating liner. That throat is what lets you pull large conductors through a 5 inch termination without the wire jacket bearing on a bare metal edge, which is the usual reason an inspector flags an uninsulated fitting on a feeder.

Malleable iron, which is what the 5385 is made from, is the heavier-duty choice and is what you normally see at large trade sizes on industrial equipment where the fitting can take mechanical abuse. Die cast zinc bodies are common on small trade sizes for lighter commercial work. At 5 inch the weight of the conduit alone argues for the iron body.

The liquidtight seal on the 5385 is between the fitting and the conduit. If the enclosure side also has to stay wet-location rated, you add a sealing locknut or a gasket at the knockout, the same as with any liquidtight connector. On a 5 inch opening confirm the knockout is a true 5 inch trade size, not a reducing washer stack.

Both land a wiring method into an enclosure while keeping moisture out, but they grip different things. The Thomas & Betts 5385 is a straight liquidtight connector built for liquidtight flexible metal conduit in a 5 inch trade size, with an insulated throat and a malleable iron body. The Bridgeport Fittings 597-DC2 Mighty-Seal is sized for 3/4 inch PVC-jacketed MC/TECK cable and has a zinc body, clamping the cable jacket directly with no conduit run involved. Choose by what is already pulled on the job: conduit run points to the 5385, jacketed cable points to the cable connector.