Here is a 3M Butt Splice Package of 100 Nylon Connectors, 16-14 AWG,  UL E96029 BNYDF2, 600V. New in Package.
Model # 4FRK2 
 
Product Details:
Connector splices existing connections into other wires without cutting. The nylon insulation is a durable option that provides a higher temperature.
Technical Specs:
Connector Type: Butt Splice
 Insulation Type: Nylon
 Insulation Color: Blue
 Connection Type: Crimp
 Wire Range: 16 to 14 AWG
 Max. Temp.: 221 Degrees F
  Max. Voltage: 600V
Connection Material: Copper
 Standards: UL Listed/cUL