NXT Technologies RJ45 to RJ45 Ethernet Coupler Female to Female NX56843 - Walmart.com
ASI RJ45 Bulkhead Connector Right Angled Shielded Front Mount Female to Female ASICPICRJ45RA - The Home Depot
RJ45 Ethernet Splitter Cable, TSV RJ45 1 to 2 LAN Network Adapter Ethernet Splitter Cable Male to Female Fit for Cat5, Cat5e, Cat6, Cat7 LAN Ethernet Socket Connector Adapter - Walmart.com
Pearstone Ethernet Female to Female Inline Coupler A-RJ45FF B&H
RJ45 Female Connector for Embedded Board 10pcs from Ingketech on Tindie