The 1399G1-BK is a short, red spacer with a hole, designed as an accessory for Powerpole® 15-45 series connector housings. Its primary function is to separate housings in high-power applications to minimize derating. This spacer is recommended for squaring off a block of housings, preparing them for use within connector shells or mounting clamps. The integrated hole provides a means to fasten the entire connector block to a panel or surface. By using these spacers, designers can create keyed connector blocks to prevent mismating and ensure proper assembly.