3M™ Scotchlok™ Butt Connector Nylon Insulated, 100/bottle, MNG14BCX, built-in wire stop for correct positioning, 500/Case. 3M™ Scotchlok™ Color-Coded Butt Connector ensures an ideal fit while offering reliable and safe performance. The connector has a nylon-insulated, butted-seam barrel and withstands temperatures of -40 to 221 degrees F (-40 to 105 degrees C). Copper construction offers good conductivity and a tin-plated finish resists corrosion.