300 Pcs Red Electrical Wire Connectors Screw Terminals, with Spring Insert Twist Nuts Caps (AWG 18-10): Amazon.com: Industrial & Scientific
Do it Large Red 18 AWG to 10 AWG Wire Connector (6-Pack) - Anderson Lumber
IDEAL Push-In Wire Connectors 3-Ports Orange (10-Pack) in the Wire Connectors department at Lowes.com
Eagles 50Pcs Twist on Wire Connectors - Red #14 - #12 AWG Wire Cap Bulk with Spring Inserted, Easy Screw on Electrical Caps: Amazon.com: Tools & Home Improvement