This is a piece of heavy wall MIL-SPEC heat shrink tubing from FTZ – 2 inches nominal outside diameter, 12 inches long, in black.
It's the serious stuff – made for military and aerospace applications, with built-in adhesive sealant that melts when you heat it, creating a watertight and strain-relief seal.

It's a new open-box item – stored in a warehouse bulk lot, but never used.

Heavy wall means it shrinks down to provide mechanical protection and insulation for large cables, harnesses, or splices.
The sealant makes it perfect for underwater or outdoor connections – think marine wiring, underground splices, or industrial machinery in wet areas.

If you need a high-rel heat shrink for a critical job, this is it.
Not your average hardware store stuff – this is the real deal.
Cut it to length, slide it over your wire, hit it with a heat gun, and watch it form a tough, sealed sleeve.