Shielded Silver CAT.5E Female to Female Modular Inline Coupler is widely used in daily life. Make a network extension cord out of two CAT5 or CAT5e network patch cables with an RJ-45 coupler.
Each jack accepts one RJ-45 plug, allowing you to plug high-speed Ethernet cables into both sides.
With a double-shielded housing and gold-plated contacts, thiscoupler is designed for 100BASE-TX (100Mbps) networks.This shielded coupler is designed to join 2 Ethernet cables together with minimal signal loss.

Cat5e Inline Coupler (Shielded) Introductions
 
Make a network extension cord out of two CAT5 or CAT5e network patch cables with an RJ-45 coupler.
Each jack accepts one RJ-45 plug, allowing you to plug high-speed Ethernet cables into both sides.
With a double-shielded housing and gold-plated contacts, thiscoupler is designed for 100BASE-TX (100Mbps) networks.
This shielded coupler is designed to join 2 Ethernet cables together with minimal signal loss.
 
Technical Details
Product Type: Network Adapter.
Connector on First End: 1 x RJ-45 Female.
Connector on Second End: 1 x RJ-45 Female.
Just a little further, you're almost there.then your computer crashes to the floor!
Why would you couple two shielded patch cables? One's too short.
Join them in this metal coupler for the most durable connection.