I want to put an auto top off valve in a sump that can't be drilled. I looked at auto top offs on the bulk reef supply page and it shows one that moves up and down and you dont have to drill it because it clamps on. It is a reefkeeper float switch kit. It has digital crud along with it. Is this a part of a big package that all plugs together or can I just use it like an old fashioned top off. In other words RO water in a bucket, line runs to float valve in sump, when water gets low RO water goes in until desired level is reached. I don't want something fancy. I saw what I wanted on Marine depot but noticed a group buy for bulk reef supply coming up. Thanks.