Switchcraft EHRJ45P5E RJ45 Cat5 Feedthru Panel Mount Connector (Unshielded)
Amazon.com: ASI ASICPICRJ45S RJ45 Panel Mount, Waterproof Connector (When Used with Cap), Shielded, Front Mount, Female, IP67, NEMA 6P, Cap Sold Separately : Electronics
Soigeneris - your resource for hi-tech hobbies. Panel Mount Ethernet Cable
Amazon.com: PENGLIN 2Pack Waterproof RJ45 Shielded Panel Mount Coupler, CAT6A Ethernet LAN Pass Through Connector, IP67 Female to Female Bulkhead Extension Interface Adapter : Electronics
Panel Mount Ethernet Extension Cable : ID 909 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits