Steel City Raintight EMT Compression Coupling (Non-Insulated)

Six trade sizes: 1/2 inch (TK111AN-RT), 3/4 inch (TK112AN-RT), 1 inch (TK113AN-RT), 3 inch (TK118A-RT), 3-1/2 inch (TK119A-RT) and 4 inch (TK1110A-RT). Note there's a gap between 1 inch and 3 inch, so if you're running 1-1/4, 1-1/2 or 2 inch EMT you'll need a different coupling.

That's what the raintight design is for. The compression gland seals against the tubing wall so water doesn't track into the raceway at the joint, which is why electricians specify this style for exterior walls, rooftop runs, parking structures and wash-down areas rather than the cheaper setscrew coupling. Steel body with a zinc plated finish for corrosion resistance.

Use compression where moisture is a factor or where an inspector calls for a raintight joint. Setscrew couplings are faster and cheaper but are for dry indoor locations only. Steel City's raintight compression couplings are steel with a zinc plated finish and cover 1/2 through 1 inch plus 3, 3-1/2 and 4 inch trade sizes. In concrete or direct-burial applications you need fittings specifically listed for that use, not a raintight coupling.

Yes, the Steel City raintight compression couplings carry UL file E16592.

Non-insulated means there's no insulating throat liner in the fitting. On a coupling that joins two lengths of tubing it rarely matters, since conductors aren't being pulled past a cut edge into an enclosure the way they are at a connector. Where an insulated throat is required to protect conductor insulation, that requirement applies to the connector at the box, not to the coupling in the middle of the run.

No. These are EMT fittings, sized to electrical metallic tubing outside diameters, and they join one length of EMT to another. To transition to rigid, IMC or flex you need a combination coupling or the appropriate connector pair for those raceway types.

No prep beyond a clean, square cut and a deburred end. The tubing slides into the coupling and you tighten the compression nut down onto the gland ring, which grips and seals the tubing. Nothing threaded, no cement, no tools past a wrench, which is why compression fittings go up quickly on retrofit work in occupied buildings.

For a facility with both indoor and exposed runs, the raintight compression coupling is the one that works in either place, so it is a reasonable single-line standard for maintenance stock. Steel City covers 1/2, 3/4 and 1 inch for branch circuit work and 3, 3-1/2 and 4 inch for feeders and service risers under UL file E16592, all zinc plated steel.