Squeeze these splices onto thicker wire than crimp-on butt splices—up to 4/0 AWG. Check the color coding and wire gauge on the splice to match it with the right compression tool.

These splices connect thicker wires than crimp-on butt splices—up to 1000 MCM. Tighten the set screw onto the wire instead of crushing the body, like you do with compression butt splices. That makes these splices reusable and easier to install.

Connect large wires of different sizes, as thick as 4/0 AWG. Colored stripes differentiate the larger and smaller openings so you don't have to measure and mark them yourself. Check the color coding, wire gauge, and compression die reference number on the splice to match it with the right compression tool.

Connect two components with different wire sizes, such as a large air compressor and its control panel. Also known as step-down splices, these splices join a larger wire and a smaller wire end to end. Colored stripes differentiate the larger and smaller openings so you don't have to measure and mark them yourself. Attach your wire with a crimping tool to avoid a damaged splice and loose connection.

Slide large wires in and tighten the hex nut for a strong, secure hold between the wire and screw. Loosen the hex to make a quick adjustment or to reuse the splice elsewhere. These splices are easy to use, but the connection isn't fully protected by the body of the splice.

Connect and secure wire that's frequently pulled, jostled, or vibrated. Insert your exposed wire ends in the splice, then pass a heat gun or butane torch over the body. When heated, the enclosed solder melts around the wire for a stronger, more rigid connection than unsoldered wire.

A step up in grip strength and conductivity from standard wire connectors. Twist your wires together and crimp them so they hold securely when tugged or jostled. For rain and splashes, choose heat-shrink crimp-on wire connectors instead. For wires on or around vibrating equipment, consider tight-hold heat-shrink connectors.

Lay the main wire into your tap on the first try instead of poking and threading. The tap wire connects parallel to the tap or at 90°, so the tap will slide into your setup at different angles. Strip both wires and slide off the screw plate before installation. Tighten the set screws onto both wires for a secure connection.

Covers—These covers fully insulate the tap so moisture can't reach the wire. They snap shut so you don't have to tape them down.