Corp.The 321-25004 is a heat shrinkable tubing designed to protect wires, cables, connections, and components from abrasion and corrosion. This 4:1 shrink ratio tubing features a wall thickness of 0.170", and an adhesive lining that ensures a watertight seal. It is manufactured in black by HellermannTyton Corp, and has a nominal shrink diameter of 48mm (1.89") down to a minimum recovered diameter of 12mm (0.47"). It is best suited for applications where extra insulation is needed against environmental hazards, such as automotive, aviation, marine, and industrial applications.