I have been using Cat5 cable from windy city wire and I have never had so many bad crimps in my 10 years in the field. I have not had a problem with this wire and west penn cat5 cable. I guess check with wire manufacturer before buying this product.
Works well, and guides wire into individual slots. You have to know the color code.
36-610 - RJ45 In-Line Ethernet Coupler Female to Female
Modular coupler female-female Ivory
I ordered batteries and a set of test leads. I received them within three days of when I ordered them and I got a great price. Fast service and a great price - what more could you want.