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How to replace Fluidmaster 300 cap assembly?

A brief guide on replacing a Fluidmaster 300 Fill Valve Repair Kit - Cap and Stem Sub Assembly (Part No. GENGR-024).

GENGR-024 FM300 Valve Repair Kit

  1. Close water supply to the fill valve.

  2. Actuate the float to depressurize the fill valve

  3. Twist the cap and float assembly ¼ turn CCW NOTE: Raise the float arm to aid in removing the cap and float assembly.
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  4. Pull off the cap and float from the fill valve.
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  5. Remove the new cap and float assembly from its carton.
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  6. Remove plastic wrap from cap and make sure rubber seal and pin are intact
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  7. Line cap over the fill valve tube and push onto fill tube. NOTE: Raise the float arm to aid in removing the cap and float assembly.
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  8. Turn ¼ turn CW until it snaps into place.
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  9. Lift float up to make sure it is there is no interference with its function with any other tank component.
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  10. If the float interferes with any interior component, adjust the position of the fill valve utilizing appropriate steps based upon the installation.
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