UP-98139 12-10 to 8 AWG CS Multi-Wire Heat Shrink Connector – Clear w/ Yellow Dash, 5 Pcs.

4x Adhesive on inside melts down to protect wires from corrosion.Connects two wires of smallest listed AWG to one of the same gauge on the opposite end.For instance on the Blue Dash version, you can put two 14-16 GA wires on the 'yellow' end and one 14-16