The Wirefy BHT125-200 22-16AWG Heat Shrink Butt Connectors provide a secure and waterproof connection. The tinned copper barrels ensure maximum current flow and strong wire grips, while the dual wall heat shrink tubing offers a low temperature recovery starting at 176F, with wide range operating temperatures between -67F and 257F. They are also easy to crimp and come in a convenient reusable storage case.