Splicing wire together.... I gave up on butt connectors 15 years ago. When I put two wires together I strip back about an 1 1/4" of plastic covering. Slide about 1 1/2" of heat shrink down one side. I take the raw wire and twist it together and wrap it back over itself. Pack it all tight together, cover it with the 24hr red tube 5200 then pull the heat shrink down over it. Heat from the center till the 5200 squezzes out each end. Wipe off with an acetone paper towel. In two days that is a wire connection you can leave lay in bilge water for 10yrs and it won't phase it.. Screw buying 3 self sealing butt connectors for 5 bucks. My connection is simplier, cheaper and better, lots better.