Nylon Closed-End Wire Connector with Crimp Sleeve, 1000 Bag
https://hotfix.nsiindustries.com/product/nylon-closed-end-wire-connector-with-crimp-sleeve-1000-bag/
Easy-Twist wire connectors are the professional choice for forming quick, secure connections between wires in the field. The internal crimp sleeve design forms a secure join and the compact design of the connector fits into a junction box or other tight space.