The 1473574-4: Both ends accept female sockets, so it mates with two male headers — useful for extending a signal path or bridging two board-mounted connectors in a panel-feed application. The 0.079" (2.00mm) pitch and 0.256" (6.50mm) row spacing set the board layout: the footprint needs clearance for two rows of contacts spaced 6.50 mm apart, with the 2.00 mm pitch between adjacent positions within a row. Panel mount, snap-in means it locks into a cutout without screws or brackets — a clean install for a bulkhead or chassis wall.
Snap-in panel mounting: push the adapter into the panel cutout until the retention latches engage. No additional hardware needed. Both ends are receptacle, female sockets — so you need two male headers (one on each side) to complete the connection. The 2-row, 4-position layout means each side mates with a 2x2 male header at 2.00 mm pitch. The adapter does not change gender; it passes the signal straight through.