What This Dust Cap Covers
The Molex 1731120109 is a 15-position dust cap from the FCT 173112 series, designed to cover and protect unmated D-Sub female connectors. The metal chain tethers the cap to the cable or panel so it stays with the assembly during service — no loose covers to track down.
Fit Check: Does It Match a DB-15 Female?
Yes — this cap is listed for use with D-Sub female connectors, and the 15-position count aligns with the standard shell size. It snaps over the connector face and covers the pin cavity area.
What the Metal Chain Means in Practice
The metal chain is the distinguishing feature here — it permanently attaches the cap to the cable bundle or panel via a small ring or loop. In a rack or cabinet where multiple D-Sub ports sit side by side, a tethered cap won't wander off or get swapped onto the wrong connector. Field technicians appreciate not having to dig for a loose cover.