The TE Connectivity 172200-1 is a seal protector for the EconoSeal J series — a molded silicone rubber boot that fits over the connector's rear wire seal to shield it during handling and installation. It is not a connector or a terminal; it is the piece that keeps the seal lip from rolling or tearing when you push the wires through the back of the housing. Black in color, bag packaged, and ROHS3 compliant.
The silicone rubber material stays flexible across the EconoSeal J's operating temperature range — it compresses around the wire bundle without cracking and recovers when the connector is unmated. If you are building a harness that goes through a washdown or underhood environment, skipping this protector is what lets contamination wick past the seal face. Fit it before you seat the secondary lock.