good switch, but watch the treading By Reefer Dave on 3/28/2016Reefer Dave would recommend this product to a friendThis switch works great for ATO and low/high water alarms. High quality construction and all sealed contacts. The only problem is the 1/2" male threading is not a tapered (pipe) thread and will not form a watertight connection with the bulkhead. The solution is to use some silicone on the threads as thread sealant. If it needs to be replaced I will just pop off the whole bulkhead and replace that way.