Guitar pedal couplers are those straight metal male/male 1/4″ jacks that seemingly allow you to connect all your pedals together using minimal space on your pedal board. Yes, this may seem like a great idea on the surface, but it should never be done under any circumstance!
Why? Because not allowing any flex between connections of pedals, different jack height (even slight) and the constant pressure of stepping on the pedals, will destroy jacks as well as the circuit boards they’re soldered to! Needless to say, you do not want to do this.
Instead, use something like these patch cables. This way you will have flex between each connection, and there will be no risk of destroying your investments! You’ll thank me later!