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Hey Steve, I don't have a link to the dosers but its pretty simple. Just 2 half gallon containers from target ( three bucks each) some airline tubing & airline valves. The only tricky part is drilling the holes in the container bottom. Make sure they are just big enough to force the tubing through so it will self seal. You can always come by to check it out if you want. I'm at work until 6 today These are the simple instructions another guy here sent to me... I will post the link to the thread in chat