IP68 Waterproof External Electrical Junction Box, ELifeApply 2 Way 2 Wire Connector for Underground Outdoor, Cable Range 4.5-10 mm, Shielded, Field Installable - 2 Way 2 pin - Newegg.com
Hampton Bay Low Voltage Black Replacement Cable Connector (2-Pack) HD28353 - The Home Depot
Junction Box Outdoor 2 Way Waterproof IP68 Electrical Cable Connector ,M16 Wire Range(3.5-10mm),Suitable for Repair and Extend Power Cables,UL(5 Pack) - Amazon.com
Low Voltage Fastlock Landscape Lighting Wire Connector, 24Pcs 12-14 Gauge Waterproof Cable Connectors for Outdoor Path Lights Work with Malibu Paradise Moonrays and Other Low Voltage Lighting - Amazon.com
DryConn 316 IR+ Outdoor Low Voltage Irrigation Wire Connector (30-Pack) 98230 - The Home Depot
5 Pack EW M16 3P Outdoor Cable Connectors, PA66 Brass Silicone Black IP68 Water Resistant 7 to 10mm 3 Conductor Wire Connectors for Repair and Extension of Power Cords - Amazon.com
FluxTech - IP66 Outdoor Waterproof 3 Way Cable Connectors Junction Box – FluxTech LED