It's a two-row, 3.81mm-pitch panel-mount housing that accepts tab-style crimp contacts — the matching receptacle uses female socket contacts.
The 0.150" (3.81mm) pitch is wider than the 2.54mm signal standard — that extra spacing gives you more creepage for higher-voltage runs, and the 0.200" (5.08mm) row spacing keeps the two rows well separated. The 16 positions match a 16-circuit BOM line; if your circuit count is different, you'll need a different member of the D-3100 family. The housing uses a push-pull fastening system — no locking ramp or screw, just a positive push to seat and a firm pull to release. That's fine for panel-mount applications where the housing is bolted in place and the cable isn't yanked.
The contact type is tab (male), so you'll need the matching Dynamic D-3100 crimp tab terminals. The push-pull retention holds the contact in place. If you're building a harness, factor in the extra line item for the contacts and a hand-crimp tool that matches the wire gauge.
The 178803-7 is a 16-circuit, two-row panel-mount plug. A sibling like the 1-1703532-1 is a 2-circuit, single-row free-hanging plug with a locking ramp and a sealed housing — a very different part for a sealed, low-circuit-count application. The 1-2069332-1 is a 4-circuit, two-row panel-mount receptacle (female socket contacts), not a plug. The 1-2333134-5 is a 30-circuit, two-row free-hanging receptacle on a much finer 2.00mm pitch. None of these are a direct swap for the 178803-7 — the circuit count, pitch, mounting, and contact gender all differ. If you need a 16-circuit, 3.81mm-pitch panel-mount plug, this is the one.