HopCar wrote:
Ron, I sell hundreds of bilge switches every year, most of them are Rule. Back when Rule used mercury switches we got far more returns than we do now. I took apart a bunch of the returned ones and the mercury switch never was the problem. The wires broke where they were forced to twist each time the float would rise and fall. We get far fewer returns on the new non-mercury switches. When we do get a return it's usually because the switch sticks and won't rise with the water. They seem to have addressed the breaking wire issue.
If they had addressed the breaking wire issue, you would have seen few returns.
I used to service commercial fire alarm systems and many had mercury switches in the pull stations (I have no idea why).* At one time I had several of the switches, but I suppose I threw them away when I moved.