I was under the impression that RO units aren't supposed to be directly hooked up to the sump for auto top off as they aren't designed to be run for short times to produce small amounts of water. Also if it fails it could be catastrophic for your tank.
My auto top-off consists of a larger rubbermaid container (about 15 gallons or so) hooked up to a float valve in the sump. I fill the rubbermaid with topoff water weekly. This way if the float valve does fail I only have a few gallons added to my tank instead of an infinite amount if I'm not paying attention. If I am away from the tank longer than a week I have a large garbage can with a john guest fitting on the end that I can use in place of the rubbermaid (I don't use it permanently as its kind of unsightly in the room).
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