ok the top off will consist of a float switch,relay, extension cord,12v power supply. The extension cord can be bought for about $5. the 12v power supply should be about $10. But you may have one laying around the house somewhere. So if i go buy everything i would say about $35. I am going to go and get the final prices on the kalk reactor tomorrow. I will have a price on the cord then as well. Maybe even find the power supply while im there. So i am going to order the float switches tomorrow so i will need to know who all wants in tonight if possible.