M7928/5-5, 320570 TE Connectivity AMP. 320570 is a Mil Spec Window Closed Barrel Wire Splice. The unique “window" feature within the 320570 splice assists in wire splice inspection. This splice is mil qualified to M7928/5-5 and is suitable for crimping to 12-10 AWG wire. Yellow insulation sleeve. We buy these in volume and therefore can pass the savings along to you. Also known as NAS1388-3.