100-Piece 12–10 AWG Yellow Heat Shrink Butt Connectors, Waterproof Insulated Crimp Wire Splice Terminals, 3:1 Shrink Tubing

Heat Shrink Butt Connectors bring together wires inside a solid, seamless tinned red copper barrel to form a dependable connection. Polyolefin tubing surrounds the barrel, and its heat-activated adhesive lining shrinks around the connection when heated, helping create a snug, sealed fit. A 3:1 shrink ratio is printed on the tubing, highlighting its ability to contract around joined wires during heat application. Wire gauge imprints make connector sizes easier to identify and match to wires at a glance. To make a connection, choose the marked connector that matches your wire, then apply heat so the tubing shrinks around the joint. The combination of a tinned copper barrel, adhesive-lined heat shrink tubing, and clearly printed gauge markings brings key joining and identification details together in one connector.