Ok I grasp the concept of how it works and what I need. Prob is I don't have a glass hole saw and I don't wanna try drilling my 55 gallon sump and risk breaking it. I wanna install a simple float valve in my sump so my ro will auto top up instead of me waiting for the eater to drop and manually fill it. Problem is I can't find a good cheap one and I can't figure out how to install it as I will have to hang it off the sump. I know jl sells an already set up kit for it for 35$ pkus s/h I just don't wanna pay or wait lol. I'm impatient... Does anyone know where I can buy a float valve in Windsor that will suit my needs and how I can fabricate somethinf to mount it? I'm hoping someone has done this already.... Help