Also known as wire nuts, simple twist wire connectors than can be used for low voltage connections or to cap-off a conductor.

3M R/Y+, Red/Yellow - Electrical Wires

915924-5 3M Twist On Wire Connector, Application Wide Range, Wire Connector Style Standard, Color Blue/Orange

IDEAL 452 Red WING-NUT Wire Connectors (100-Pack) 30-452P - The Home Depot

3M 7100127167 3M™ Performance Plus™

Find Twist-On Wire Connector: Blue & Gray at MSC Industrial Supply, serving the metalworking, safety, and MRO industries for over 75 years

Twist-On Wire Connector: Blue & Gray

3M 3, 20 to 3, 16 AWG, 300 Volt, Fire Resistant, Standard Twist on Wire Connector Blue, 221°F 7010304019 - 72365711 - Penn Tool Co., Inc

3M Twist-On Wire Connector 412-BAG

3M Performance Plus Wire Connector, Flexible Steel Spring Connectors, 22-8 AWG, Red and Yellow Color (R/Y+), Jug of 500: Electronic Component Interconnects: : Tools & Home Improvement

3M T/Y+POUCH T/Y POUCH TN/YL Wire C

3M Twist-on Wire Connectors

Twist On Wire Connector,18-8

3M Twist On Wire Connector, Application Wide Range, Wire Connector Style Wing, Color Red/Yellow

3M H-33-BIN Twist On Wire Connector,22-10 AWG,PK1000 - Yahoo Shopping

3M Twist-on Wire Connectors for Energy

Macromatic TH41266-07, Time Delay Relay, On Delay Switch Trigger, SPDT, 12V DC, 0.3 to 30 sec.