Thomas & Betts LTGUS08G-G LFMC GP UL 2-1/2IN GRY 80M/275FT

It's 2-1/2 inch trade size liquid tight flexible metallic conduit, supplied as a 275 foot (80 m) continuous length. That trade size is meant for large feeder and service runs, not branch circuit whips, so plan your connector sizing accordingly.

Galvanised steel core, jacketed in a grey PVC outer. Steel core LFMC gives you the crush resistance and pull strength for larger raceway runs; if a job spec calls specifically for aluminum core flex to save weight, this is not that product.

Liquid tight flexible metallic conduit with a PVC jacket is the product type used for wet and oily locations and for equipment that vibrates, which is exactly the rooftop mechanical and pump connection case. The grey PVC jacket over the galvanised steel core is what keeps water out of the raceway. Confirm the specific location and temperature listing markings printed on the jacket against your inspector's requirement for the installation.

Grey. Color on LFMC is normally used for jacket identification on a site, so if your facility standardizes runs by jacket color, the grey jacket is what you're getting here. There is no other color offered under this model number.

The 80 m / 275 ft figure is the net length of the reel, supplied as a single coil. For a maintenance shop that means one purchase covers multiple equipment drops; for a contractor running a single long feeder, check that 275 feet covers the pull before you commit, since there's no longer reel under this model number.