The heat shrink butt splice is an irradiated thermally stabilized heat shrinkable dual wall sleeving composed of an outer tube coated on the inner surface with a meltable polyamide adhesive. Simply put: it's a piece of dual wall heat shrink with a crimp splice inside of it. You crimp the two pieces of wire together, and then heat the splice with a hot air gun so that the outer sleeve shrinks and the adhesive melts and flows to give a fully sealed water tight joint. The butt splice is resistant to water, spray, oil, saltwater and most hazardous chemicals.

| Wire size range (AWG) | Current Rating | Color | Price/pack | pcs/pack | Ordering |
| 22-16 | 19 |
Red |
$20 | 25 | |
| $60 | 200 | ||||
| $400 | 2000 | ||||
| 16-14 | 27 |
Blue |
$25 | 25 | |
| $75 | 200 | ||||
| $500 | 2000 | ||||
| 12-10 | 49 |
Yellow |
$35 | 25 | |
| $100 | 200 | ||||
| $335 | 1000 |
Military Specification (M23053) and Manufacturers' Cross Reference List
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