The heat-activated adhesive is integrated into the sleeve of the heat shrink tubing in Ancor heat shrink connections. These connectors provide a watertight seal and provide the best vibration and strain reduction when heated pure copper for optimal current flow, tinned for corrosion resistance. The heat-activated adhesive lining seals off the saltwater, oil, acids, and sunlight while also giving strain relief. Key Features: UL-listed and CSA-approved. It shrinks to 1/3 of its former size, the highest shrink ratio. At 257 degreeF/125 degreeC, it shrinks. Temperature range of operation: 40 degreeC to 110 degreeC. PVC tubing is substantially weaker than cross-linked polyolefin tubing, which does not burn. The seam is brazed for optimum strength. Experts use Nylon insulators for their Marine Grade resistance to sunlight, water, oil, chemicals, vibration, and cut-through damage. Specification: SKU: 1-312325 UPC: 091887316100 Weight: 0.14 LBS Qty _ Pkg: 25 Wire Range: 12-10 Screw Size: 10 Manufacturer Part Number (MPN): 312325 Brand: Ancor Heat Shrink: Yes Type: Ring Terminals Ancor heat shrink connectors offer heat activated adhesive built into the sleeve of the heat shrink tubing. When heated, these connectors form a water tight seal and the ultimate vibration and strain relief.