Rule 35A A-Matic Bilge Pump Float Switch, Mercury,White

good and effective

So far so good. So far this has worked great for us Super fast shipping! That is what you have been looking for Good value for price I like this so much,I now have two

Although a bit light in weight it does the job well, I attached a magnet to the bottom of it to keep it attached to my steel hull of my narrow boat.., It works well no problems

Only lasted a few months and then it stuck in the 'on' position. The last one did the same so not impressed with the poor quality of this product.

Had this installed in the sump of my Dory. After a few months found the float had distorted around the hinge, and it stuck in the "on" position flattening the battery. This is the second one I have had to junk. I will look for something different next time.

For what claims to be a submersible switch, it disappointingly failed after 2 weeks, and when I cut it open to find out why, I found it full of water. Not good if you are relying on it to prevent your boat sinking.

You can get thse on ebay for £8.50. No matter the supplier, they all look identical and clearly all come from the same chinese manufacturer. Most fail within two months. Longest I've had one last is 6 months. As other say, they fill up with water and flatten your battery. Complete junk and unless you want your boat to sink, do not buy.