3M - 22 to 16 AWG, Blue, IDC, Run & Tap Quick Splice Connector - 73125536 - MSC Industrial Supply
Low Voltage Wire Connectors - B Connectors Silicone Filled Wet B Gel Telephone Alarm Wire Crimp Bean Type Splice for Low Voltage Application, Blue (1000Pcs): Amazon.com: Industrial & Scientific
1,000 PCS Blue Wire Connector, P2 Type Easy Twist-On Ribbed Cap - UL Listed: Amazon.com: Industrial & Scientific
Bird Jolt Flat Track Wire Connectors | Bird B Gone
DryConn Large Waterproof Wire Connectors - Aqua/Blue (6-Pack) | Outdoor/Underground | UL Listed | Weatherproof | 600V Rated in the Wire Connectors department at Lowes.com