Thomas & Betts LTBUS04L-J LFMC CMP UL 1IN BLU 120M/400FT

It is 1 inch trade size liquid tight flexible metallic conduit (LFMC), supplied as a 400 ft (120 m) coil. One coil covers a lot of whip work, so order by coil rather than by the foot when you are running multiple motor or rooftop unit connections.

There is a galvanized steel core inside the jacket, so this is true LFMC, not a nonmetallic flexible raceway. The steel spiral gives it crush and pull resistance and lets it be used where a metallic raceway is specified; the outer jacket is what keeps liquids and dust out of the run.

Yes, it is a UL product per the manufacturer's designation for this item. That matters on institutional and commercial jobs where the inspector wants a listed liquid tight raceway at motor, pump and HVAC equipment terminations.

The LTBUS04L-J is jacketed in blue, which contractors and facility electricians commonly use to keep one system visually separate from standard gray raceway, for example isolating control, data or a specific service in a mechanical room or on a rooftop. Electrically and mechanically it is the same construction as the gray version: galvanized steel core with a liquid tight jacket over it.

LFMC is the short flexible connection between a rigid raceway and something that vibrates, moves, or sits in the weather: rooftop units, pumps, compressors, motors, and outdoor disconnects. The jacket keeps water and washdown out, and the galvanized steel core handles the mechanical abuse that a nonmetallic flex would not. For long fixed runs you would still use EMT or rigid and use this 1 inch product only for the whip.