Underground Direct Burial Wire and Extension Cord Splice Kit for #10#12#14 AWG - 3 Wires - 3 Connectors, and 3 CLEAR Dual Wall 3M Heat Shrinks w/ 8" Long BLACK Heavy Dual
3-Wire Easy-Splice Block
Proper wire joint and soldering 3 way - YouTube
Rope Light - 3-Wire, 13mm (1/2"), 6' Splice Cable, White
Cold 3-Wire Splice (UR) - 10 pack : ID 1495 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Cold Splice Wire Tap (UB) - 10 pack : ID 1494 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits