Steel City 90 Degree Plastic LT Connector

Four trade sizes: 3/8 inch (LT-590), 1/2 inch (LT 591), 3/4 inch (LT 592), and 1 inch (LT 593). Match the trade size to the liquidtight flexible conduit you are terminating, not to the knockout in the box.

Non-metallic. The Steel City LT 59 series 90 degree connector is a plastic body, so it does not provide an equipment grounding path the way a steel or die-cast liquidtight connector does. If the run relies on the conduit and fittings for grounding continuity, you need a metallic connector instead; with a non-metallic fitting, pull a separate equipment grounding conductor.

Use the 90 when the conduit has to turn immediately at the enclosure, typically a tight clearance behind a panel, a motor, an A/C disconnect, or a box mounted close to a wall or ceiling. The elbow is built into the fitting so the flex does not have to bend inside the minimum radius it can take. If you have room to sweep the conduit into the box, a straight connector is the cheaper and simpler termination.

The LT-590 is the 3/8 inch trade size in the LT 59 series, and 3/8 inch is the usual size for short whips to motors, disconnects, and light fixtures. The connector body is non-metallic, so while it will terminate 3/8 inch liquidtight, it will not carry grounding continuity through the fitting; run a grounding conductor inside the whip.

LT 593 is the 1 inch trade size in Steel City's 90 degree non-metallic liquidtight connector line. The 3/4 inch below it is LT 592, which is the size most often used for larger rooftop and outdoor equipment whips.

Yes, and it is a reasonable stocking decision for an MRO crib: the same 90 degree plastic liquidtight body is offered in 3/8, 1/2, 3/4, and 1 inch, so one series covers control whips through larger equipment feeds. Keep in mind the non-metallic material means every run using them needs its own equipment grounding conductor, so be consistent about that in your spec.