I've used these for 15+ yrs without issue in sumps on various systems.
Trough-O-Matic Stock Tank Float Valve with Plastic Housing
You need to replace the pivot pin with plexiglas 1/8" rod and use nylon bolts into plexi support to attach the float valve to container.
One thing to note about leak detectors, most rely on the water being conductive. RO/DI water is not conductive as it has no minerals.
Cheers,
Tim
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