Wire Harness / Electrical Tubing - Heat Shrink Tubing Grayline electrical heat shrink tubing and wire harness tubing serves to electrically insulate, bundle, and protect wires and other components, providing an environmental seal to prevent liquid, gaseous or solid contaminants from reaching sensitive components.Plastic Tubing · Heat Shrinkable Tubing Amazon: wire harness tubing Amazon: wire harness tubing. Skip to main content. Try Prime All Elitexion 127 Pc Heat Shrink Wire Wrap Assortment Set Tubing Electrical Connection Cable. 4.4 out of 5 stars 45. $7 $ 7. 99. Get it as soon as Tue, Jun 4. FREE Shipping on orders over $25 shipped by Amazon.