Gardner Bender 22-10 AWG Butt Splice Heat Shrink, Assortment (24-Pack) GBX-TK - The Home Depot
Amazon.com: Butt Connector and Heat Shrink Tubing Kit, 270Pcs with Case. Best for Electrical, Marine and Automotive Wire. 165 Butt Connectors and 105Pcs Heat Shrink Tubing : Industrial & Scientific