Also known as wire nuts, simple twist wire connectors than can be used for low voltage connections or to cap-off a conductor.
3M Twist-on Wire Connectors
3M Twist-on Wire Connectors for Manufacturing
3M Twist-on Wire Connectors for Energy
Butler Supply, 3M, 7000133222
Features steel spring construction Measures 1.17 Inch x 0.76 Inch
3M T/R-JUG 600 Volt Red/Tan Color Twist On Wire Connector, 750 Per Pack Standard, Red/Tan
3M Twist-on Wire Connectors
3M™ Secure Grip Wire Connectors
3M Wire Connectors, Red/Yellow Performance Plus Wire Range: 2 #18 - 2 #8 (30-Each Per Bag) R/Y+-30 - The Home Depot
3M, Tan/Yellow, 22 AWG – 12 AWG Twist-On Wire Size Ranges, Twist On Wire Connector - 1DLZ3
3M T/R+ WIRE CONNECTORS TAN/RED TWIST ON PERFORMANCE PLUS 18-10AWG SHIPS ASAP!
3M Blue / Orange Wire Connector - Rate for 600 V - O/B+JUG [PRICE is per CAN] : Industrial & Scientific
3M™ Performance Plus™ Wire Connectors
Twist-on wire connector - Wikipedia
3M 3, 20 to 2, 12 AWG, 600 Volt, Fire Resistant, Standard Twist on Wire Connector Yellow, 221°F 7010318552 - 54040514 - Penn Tool Co., Inc