Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? A while back, my son and I started talking about building a zip line in the backyard.

I was planning on running the wiring for my new subwoofer amp from the laundry room (where I have a new 30A circuit waiting) to the living room tomorrow. However, I just realized that in my indecision ...