Making an emergency stop switch for my Apex... push this and essentially all equipment will stop. There are several pre-made super cheap options on eBay but I wanted a low profile large aluminum switch. ** If you don't have an Apex but still like the idea of an master emergency switch post below for help. Are there any pieces of equipment you wouldn't want shut off in an emergency? I'm thinking lights because they plug into a outlet above the system and not exposed to water that may drip. Dunno. I still need to cut the box down ~40% thinner. Sticker "designed" and ordered... channeling my inner Apollo 13!