Don't take a chance when wiring electrical components. Our heat shrink butt connectors are also lined with an adhesive that will seal the connector to the wire. This provides a "corrosion proof" seal that will keep salt water, etc from interfering with your electrical components. The smaller 2218 is perfect for MSD trigger wires, coil wires, stator wiring, etc. The larger 1614 is correct for bilge pumps, etc. (20 per pack).