Morris Products 12144 Butt Splice Connector, Nylon Insulated, Red, 22-16 Wire Size  (Pack of 100) Nylon Insulated Butt Splice Connectors - Nylon Insulated Butt Splice Connectors for Electrical Wire Splicing. Nylon Insulated Butt Splice Connector Material: High Strength Electrolytic Tubular Copper Electro-Tin Plated for corrosion resistance Nylon Insulated Butt Splice Connector has Center Wire Stop Barrier Color Coded Insulation for easy identification