Wide, direct compatibility Direct replacement for Kohler 83143 toilet fill valve seal. Compatible with Fluidmaster models 242, 400, 747, and 200. Standard OEMsize design to fit existing Kohler/Fluidmaster fill valves without replacing the entire valve. Durable, leakproof material Made from grade rubber for long service life and reliable sealing. Resists wear and deformation to maintain a tight tank seal and prevent common leak points. Saves water, time, and money Stops tank leaks and reduces continuous running that wastes water. Extends the life of the fill valve by restoring a proper seal so you don't need to the whole valve assembly. Quick installation avoids costly service calls. Easy, tool installation Simple replacement procedure that most homeowners can complete in minutes. No special tools or plumbing experience required; clear instructions included. Ideal for fast repairs during routine maintenance or emergency fixes. Typical applications and use scenarios Fix a toilet that runs continuously: the worn Kohler 83143 seal to stop water loss and restore normal flushing. Midrenovation or maintenance: swap the seal to refresh an older Kohler or Fluidmaster fill valve without replacing the entire unit. Rental property or commercial restroom upkeep: keep spare seals on hand for quick, lowcost repairs that minimize downtime and water waste. What you get A reliable, OEMfit toilet fill valve seal compatible with Kohler 83143 and Fluidmaster 242/400/747/200. rubber construction for longterm leak prevention and consistent performance. Fast, straightforward installation that restores proper tank function and conserves water.