I was using this concept so long and i am buying this for my new cooler as this not only save time to refill but also save unwanted water waste. As in the time, when you put the tap on and forgot to see the level causing over flow and waste of water. Its working is same as that we use in toilet flush . On the same principle when water filled in the tank it will automatically cutoff water supply .
What you need is, you should have water line near cooler and now you have to fit in the same manner as required in time of toilet tank fitting, one pipe . And pierce cooler to safe and desired height use good quality rubber wascer in it and tight this to make it leak proof.
Hope i ll get a quality product rest every thing will be fine. Or else i will surely return and buy other or try in local plumbing shop. Will onemore star if it appers to be having good quality product.