Thomas & Betts LTTES12G-A LFMC WTMP 5IN GRY 8M/25FT

It's a liquid tight flexible metallic conduit (LFMC) from Thomas & Betts, supplied as a 25 ft (8 m) coil. The jacket is grey and the core is galvanised steel, so you get the flexibility of a corrugated steel core with a sealed outer jacket for wet or damp locations.

Liquid tight flexible metallic conduit is built for exactly that: the outer jacket seals the galvanised steel core against water, so it's the type used for outdoor equipment whips, rooftop HVAC units, pumps and wash-down areas. You still need liquid tight fittings at both ends to keep the seal continuous; the coil ships as conduit only, no connectors.

Yes. The 25 ft coil is conduit only. Plan on a liquid tight connector at each termination, matched to the conduit trade size and to the box or enclosure knockout, plus sealing rings where you need to keep a raintight or wash-down rating at the enclosure wall.

Go metallic when you want the mechanical protection and the crush resistance of a steel core, and where the run is exposed to impact, abrasion or heat, such as motor and compressor whips. Non-metallic liquid tight is lighter and easier to pull in tight spaces but gives no steel armor. This Thomas & Betts coil is the metallic version, with a galvanised steel core under the grey jacket.

Don't count on it. Standard practice on liquid tight flexible metallic conduit is to pull a separate equipment grounding conductor, because the flexible steel core is only recognized as a ground path within limited lengths, sizes and fitting combinations. Size the green conductor to the overcurrent device protecting the circuit and land it at both ends.

Order by the manufacturer part number LTTES12G-A from Thomas & Betts. That gets you the grey jacketed, galvanised steel liquid tight in the 25 ft (8 m) coil. If the existing runs on site are a different jacket color or a different trade size, the part number will not match, so read the printing on the existing jacket before you standardize.

For a typical equipment whip from a disconnect to a rooftop or ground-mounted unit, the 25 ft (8 m) coil normally covers it with slack to spare, and leaving a gentle loop is good practice so the conduit absorbs vibration instead of the terminations. For longer runs, order multiple coils rather than splicing the conduit, since every joint is a potential leak point.