Sigma Electric , Gray Sigma Engineered Solutions ProConnex 02-55641T Rigid Type T Body 1/2-Inch Conduit Fitting, 1-Pack, Size

I put the Sigma ProConnex T‑body to work on a tight outdoor run last month, tying together two 1/2‑inch rigid stubs and branching to a floodlight. It’s a simple part, but simple parts make or break a clean, code‑compliant installation. This one did its job without drama, which is exactly what I want from a conduit body.

Build and materials

The T‑body is die‑cast aluminum with a stamped aluminum cover and a rubber gasket. The casting on my sample was clean—no flashing in the hubs, no porous spots, and no misaligned faces. The gray finish is uniform and takes a beating without scuffing easily. The cover sits flush on the body, and the gasket has enough compression to seal without bunching or squeezing out. Everything arrives pre‑assembled, which keeps debris out during rough‑in and saves a few minutes on site.

It’s UL and CSA listed, and the fit/finish reflects that. Threads were cut true and accepted 1/2‑inch rigid/IMC without cross‑starting or binding. I didn’t need to chase any threads or fight misalignment.

Design and fit

As a Type T, this is a three‑hub body: two straight‑through and one branch at 90 degrees. The interior volume is what you’d expect for a 1/2‑inch form factor—adequate for pulling and making turns, but not cavernous. That’s fine for a single circuit or a couple of conductors, but if you’re planning multiple pulls, large gauge, or frequent transitions, consider stepping up to a 3/4‑inch body for working room and bend radius.

The cover opens up the body nicely for access. With the gasket in place, it’s suitable for wet locations when used with listed raintight fittings on the conduit. On my outdoor install, the cover sealed up cleanly after I was done landing conductors. I did a quick hose test and didn’t see any seepage past the gasket.

A quick note on what it is and isn’t: this is intended to provide access to the raceway for pulling and inspection. Conduit bodies are not automatically approved for splices; only use it for splicing if the body is specifically marked with a volume allowance. Mine wasn’t marked for splices, so I treated it as a pull point only.

Installation notes

• Thread engagement: The hubs grabbed cleanly and snugged down with a consistent feel. I like to dry‑fit the run to confirm alignment, then back it off, apply thread sealant rated for electrical fittings in wet locations, and tighten to final position. That also helps with corrosion resistance outdoors.
• EMT compatibility: Although the hubs are threaded for rigid/IMC, you can tie in EMT with the correct listed threaded adapter or connector. In those cases, choose compression‑type connectors with a gland nut; they give you more control over orientation than fixed set‑screw styles.
• Clocking connectors: One recurring nuisance with small bodies is a connector screw ending up facing a wall or soffit. Planning ahead helps—assemble the branch run to the T‑body first, clocking the connector to a serviceable position, then align your straight‑through legs.
• Cover and gasket: Leave the cover on while cutting and threading to keep chips out of the cavity. When installing the cover for good, wipe the gasket and mating surfaces clean, then snug the screws evenly. You don’t need to reef on them; a firm, even seat is better for the gasket than overtightening.
• Support and strain: Mount your conduit with proper spacing on both sides of the T‑body so the body isn’t bearing the weight or acting as a lever arm. It will last longer and stay sealed.
• Conductor management: Don’t crowd the interior. Respect conductor bend radii and fill rules. If you find yourself cramming wires to get the cover on, you picked the wrong size body.

Performance in the field

Functionally, the Sigma T‑body does what it should: it creates a clean T‑intersection and makes pulling conductors through a multi‑direction change painless. I pulled THHN across the straight run and made the branch connection without scraping insulation or kinking a bend. The inside surfaces are smooth enough that the fish tape and wire slid without snagging.

Outdoors, the gasketed cover kept out the dust from siding work and, later, the rain we got that evening. After a couple of weeks of sun and a few temperature swings, the cover screws were still snug and the gasket wasn’t weeping. That’s what I want to see from a weather‑exposed fitting.

Electrically, it’s inert hardware—its quality shows up in how it holds alignment, keeps dry, and doesn’t create headaches. On those counts, it’s solid.

Durability and corrosion resistance

Die‑cast aluminum holds up well in most residential and light commercial environments. I wouldn’t hesitate to use it in typical outdoor runs, garages, or utility rooms. In coastal or high‑salt environments, I add a dab of compatible thread sealant/inhibitor on the conduit threads and keep an eye on dissimilar metal contact points. The Sigma casting and finish didn’t show any immediate susceptibility to surface corrosion in my setting.

The cover screws drove smoothly and didn’t strip, which isn’t always a given on budget conduit bodies. I can’t speak to long‑term screw plating from a single project, but the threads feel adequate and the head slots stayed crisp after multiple removals.

Where it shines

• Clean casting and true threads reduce installation frustration.
• Gasketed, removable cover provides quick, reliable access for pulls and inspection.
• Pre‑assembled out of the box; minimal prep to get going.
• Proper listings (UL/CSA) and wet‑location suitability when used with the right fittings.
• Compact profile fits tight spots under eaves or along exterior walls.

Where it falls short

• Interior volume is tight, as with most 1/2‑inch bodies. If you’re running multiple conductors or larger gauges, jump to 3/4‑inch or larger to save yourself grief.
• Orientation of attached connectors can land inconveniently in cramped spaces. Using compression connectors helps, but it still takes a bit of layout planning to ensure accessibility.
• No marked volume on the sample I used, so it’s not approved for splicing. If you need to splice at the T, look for a body specifically marked for that.

Practical tips

• Dry‑fit the entire T‑assembly and mark clock positions before applying sealant and final torque.
• Choose compression‑type EMT connectors for better orientation control at the T‑body.
• Keep the cover and gasket clean during install; debris under the gasket is the most common source of leaks.
• If you’re on the fence about size, size up. The time saved during pulls and terminations easily offsets the marginal cost increase.

Bottom line and recommendation

The Sigma ProConnex 1/2‑inch T‑body is a well‑made, no‑nonsense fitting that installs cleanly and holds up outdoors. It checks the right boxes—aluminum die‑cast construction, removable gasketed cover, and proper listings—without trying to be anything more than a reliable access point in your raceway. In my use, it kept the run dry, made the pull straightforward, and didn’t introduce any surprises.

I recommend this T‑body for residential and light commercial work where a 1/2‑inch rigid or IMC run needs a simple T‑intersection and serviceable access. It’s especially suitable for outdoor lighting branches, service drops to small loads, and tight exterior transitions. Just be realistic about interior space: if your conductor count, gauge, or bend requirements are on the edge, move up a trade size or pick a body rated for splicing if that’s part of your plan. For typical 1/2‑inch runs, this Sigma piece gets the fundamentals right and stays out of your way—which, for a conduit body, is the highest praise I can offer.