Another float valve that can be used is a Little Giant float valve from Princess Auto (UFA probably has them as well for water troughs.) They cost somewhere around $6. You should remove the brass hinge pin and replace it with an acrylic rod. Mine worked without cleaning or maintenance for years without fail until I sold the sump. I believe I also removed the water line fitting and installed a 1/4" hose John Guest style connection (that's another $2.60
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Hinge pin replacement (acrylic rod)
The float valve installed
