The 1399G6 is a short, red spacer accessory for the Powerpole® 15/45 series of connector housings. It is used to separate housings when operating under high power to minimize derating. These spacers are also recommended for squaring off a block of housings for use in connector shells and mounting clamps. Using two short spacers can help avoid interference, while combining them with long spacers can create keying features in a mated block.