Me neither, did not know they existed. It is way better than the single gangs, I do alot of this type of extension work and I am going to get some ASAP. Thanks Infinity.:grin:
I've used them, too. Especially handy for wiring updating in existing commercial-kitchen Ansul-type systems.Yes, they're better than a typical handibox collar like Jumper posted because they fit better over the single gang hole in the surface.
We call them box extenders too. My question is: How many can you add?