midsouthelectronics.com, insulated clear connectors for insulating splices, taps, and terminations in meter centers
Burndy BIBS6003 | 25018676 | Aluminum Multiple Tap Connector
2 Pin T Connector for 22/20/18 AWG Wiring,Max DC/AC 300V 10A,IDC Self Stripping,T Tap Wire Splicer to Connect Branches to Main Wire,Car,LED Lighting,Video/Audio,and More,Clear Cover,10 PCS: Amazon.com: Tools & Home Improvement
ILSCO Cleartap Insulated Aluminum Multi-Tap Connector, Dual Rated, Conductor Range 600-2, 2 Ports PCT-2-600-EC - The Home Depot