If you have a Clamshell you know the water pump switch is in the Clamshell area. I like to travel with the pump off in case something gets turned on or something springs a leak etc. There are times while on the road (hand wash, dog water, restroom break) when we would like the pump switch on the inside of the Clamshell. I found switches (same manufacture as the ones use on the T@B) that work similar to the 3-way switch in your home. So now we have have a switch in both locations to turn on or off the pump. Here is a little diagram of how it is wired if anyone is interested.