Thomas & Betts LTBUS07R-B LFMC SPLP UL 2IN RED 15M/50FT

It is built on a galvanized steel core with a liquid tight jacket over it, so this is metallic flexible conduit rather than nonmetallic. The steel core is what distinguishes LFMC from LFNC; if your spec calls for nonmetallic flexible liquid tight, this is not the right product.

Thomas & Betts part number LTBUS07R-B. That number covers the 2 inch red liquid tight flexible metallic conduit in the 50 foot (15 m) coil, which is the only configuration this part number is built in, so there is no length or color suffix to add when you order.

Red jacket is a color-coding choice. Contractors and facility electricians use colored liquid tight to separate circuits visually in the field, most commonly to flag fire alarm or emergency power runs so anyone opening a ceiling or panel can tell those runs apart from normal power. The LTBUS07R-B is the red version of the 2 inch liquid tight; the conduit's construction is the same as any other color.

Trade sizes match up, so 2 inch liquid tight terminates into standard 2 inch conduit openings, but only through a 2 inch liquid tight connector. The conduit itself has no threads. The connector's male thread is what engages the hub or the knockout with a locknut and sealing ring. Confirm your enclosure knockout is a full 2 inch opening before you cut the coil.

For a typical single rooftop unit whip the answer is yes with room left over, since those runs are usually short flexible drops between the disconnect and the unit. The coil is 50 feet (15 m) total, so if you are feeding several units off one coil, add up your drops plus the slack loop each unit needs and order accordingly rather than assuming one coil covers the whole roof.