Morris Products 23173 Screw On Wire Connector, P3 Type, Orange, 22 - 14 Awg, 4 #16 w/1 #20 min: 1 #18 w/1 #20  Wire Combinations, 600V Max Voltage (Pack of 500) Screw-On Wire Connectors - Color-Coded Screw On Wire Connectors for quick connections anytime. Fixed Precise Conical Wire Spring No Pre-Twisting of Conductors is Required  Spring Creates its Own Thread Reusable Screw on Wire Connector Threads On or Off splice for fast and easy circuit changes and additions Tough, UL 94V-2 Flame Retardant Shell will not crack or break, even when applied to maximum wire combinations under extreme pressure