M7928/5-3, 320559 TE AMP Mil Spec Window Wire Closed Barrel Splice. The 320559 splice has a "Window" feature within splice that assists in wire splice inspection. This splice is for crimping to 22-18 AWG wire and is mil spec to M7928/5-3. Red insulation sleeve. Specially priced. Also known as NAS1388-1. Specially Priced!